Move clang/gfortran OpenMP dependency rewriting out of f_check #3862

Job	Run time
build (ubuntu-latest, gfortran, cmake)	40m 42s
build (ubuntu-latest, gfortran, make)	30m 34s
build (ubuntu-latest, flang, cmake)	40m 51s
build (ubuntu-latest, flang, make)	9m 2s
build (macos-latest, gfortran, cmake)	24m 57s
build (macos-latest, gfortran, make)	29m 38s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 33s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	10m 38s
msys2 (UCRT64, int32, Release)	22m 11s
msys2 (UCRT64, int64, Release)	26m 46s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	4m 29s
msys2 (MINGW32, int32, Release)	21m 41s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	2m 35s
msys2 (CLANG64, int32, Release)	17m 36s
msys2 (CLANG64, int64, Release)	26m 49s
msys2 (CLANG32, int32, Release)	11m 24s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	12m 42s
	5h 36m 8s

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