Multiple fixes; go1.17 compat and github actions improvements

- Use go1.17 for github actions.
- Update for go1.17. gofmt adds the go:build statements.
- Use go mod edit instead of go get for testing other packages. There's two
  benefits:
  - This removes the round trip to pkg.go.dev and use the already present local
    checkout.
  - The go get periph.io/x/conn/v3@${GITHUB_SHA} command worked if a maintainer
    push a branch, but fails for a PR. This is because the go get command does a
    clone with all the branches, so it finds the commit even if it's not in main.
    For a PR, one has to pull a specific refs/pull/ID/head ref that is not a
    branch, thus go get cannot find it because git clone doesn't know about it.
    The only way to work around is to git clone manually.
- Remove 'go version' and 'go env' since they are already run as part of
  setup-go@v2.

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         # Do not forget to bump every 6 months!
-        gover: ["1.16"]
+        gover: ["1.17"]
     runs-on: "${{matrix.os}}"
     name: "go${{matrix.gover}}.x on ${{matrix.os}}"
     steps:
@@ -36,10 +36,6 @@ jobs:
     - name: Turn off git core.autocrlf
       run: git config --global core.autocrlf false
     - uses: actions/checkout@v2
-    - name: 'go version'
-      run: go version
-    - name: 'go env'
-      run: go env
     - name: "Debug"
       run: |
         echo HOME = $HOME
@@ -198,7 +194,8 @@ jobs:
         cd ..
         git clone https://github.com/periph/devices
         cd devices
-        go get periph.io/x/host/v3@${GITHUB_SHA}
+        go mod edit -replace=periph.io/x/host/v3=../host
+        go get ./...
         go test -short ./...
 
     - name: 'Test on periph.io/x/cmd'
@@ -207,7 +204,8 @@ jobs:
         cd ..
         git clone https://github.com/periph/cmd
         cd cmd
-        go get periph.io/x/host/v3@${GITHUB_SHA}
+        go mod edit -replace=periph.io/x/host/v3=../host
+        go get ./...
         go test -short ./...
 
     - name: 'Send comments'

allwinner/allwinner_arm64.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build arm64
 // +build arm64
 
 package allwinner

allwinner/allwinner_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm && !arm64
 // +build !arm,!arm64
 
 package allwinner

am335x/am335x_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package am335x

bcm283x/bcm283x_arm64.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build arm64
 // +build arm64
 
 package bcm283x

bcm283x/bcm283x_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm && !arm64
 // +build !arm,!arm64
 
 package bcm283x

beagle/beagle_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package beagle

beagle/black/black_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package black

beagle/bone/bone_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package bone

beagle/green/green_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package green

chip/chip_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package chip

cpu/cpu_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package cpu

distro/distro_arm64.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build arm64
 // +build arm64
 
 package distro

distro/distro_nonarm.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm && !arm64
 // +build !arm,!arm64
 
 package distro

distro/distro_nonlinux.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package distro

fs/fs_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package fs

fs/ioctl_mips_like.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build mips || mipsle
 // +build mips mipsle
 
 package fs

fs/ioctl_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !mips && !mipsle
 // +build !mips,!mipsle
 
 package fs

ftdi/debug.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build periph_host_ftdi_debug
 // +build periph_host_ftdi_debug
 
 package ftdi

ftdi/no_debug.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !periph_host_ftdi_debug
 // +build !periph_host_ftdi_debug
 
 package ftdi

mt7688/mt7688_mips_like.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build mips || mipsle
 // +build mips mipsle
 
 package mt7688

mt7688/mt7688_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !mipsle
 // +build !mipsle
 
 package mt7688

netlink/netlink_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package netlink

odroidc1/odroidc1_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package odroidc1

pine64/pine64_arm64.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build arm64
 // +build arm64
 
 package pine64

pine64/pine64_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm && !arm64
 // +build !arm,!arm64
 
 package pine64

pmem/mem_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package pmem

pru/pru_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm
 // +build !arm
 
 package pru

rpi/rpi_arm64.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build arm64
 // +build arm64
 
 package rpi

rpi/rpi_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !arm && !arm64
 // +build !arm,!arm64
 
 package rpi

serial/serial_fast.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build freebsd || linux || netbsd || solaris
 // +build freebsd linux netbsd solaris
 
 package serial

serial/serial_not_win.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !windows
 // +build !windows
 
 package serial

serial/serial_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !freebsd && !linux && !netbsd && !solaris && !darwin && !dragonfly && !openbsd
 // +build !freebsd,!linux,!netbsd,!solaris,!darwin,!dragonfly,!openbsd
 
 package serial

serial/serial_slow.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build darwin || dragonfly || openbsd
 // +build darwin dragonfly openbsd
 
 package serial

serial/serial_windows.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build windows
 // +build windows
 
 package serial

sysfs/fs_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package sysfs

sysfs/sysfs_other.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package sysfs