Cross-compile patch & build instructions

[UE4SS]

Description

Changes to enable cross-compilation with msvc-wine.

How Has This Been Tested?

Follow the build instructions, which can be found in README.md included in this pull request.

Checklist

• I have made corresponding changes to the documentation.

[github-actions]

Build Details

Name	Information
PR Commit	905e014
Merge Commit	1a3dac9
Size	46.41 MB
Last Updated	Dec 8, 24, 8:02:16 PM UTC
Expires At	Dec 22, 24, 8:02:11 PM UTC

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Build Details

Name	Information
PR Commit	905e014
Merge Commit	1a3dac9
Size	28.16 MB
Last Updated	Dec 8, 24, 8:05:34 PM UTC
Expires At	Dec 22, 24, 8:05:31 PM UTC

[UE4SS]

There were some last minute fixes.
This should be ready to be tested now.

[igromanru]

Since you got a lot of if there, if it runs in wine, I guess windows shouldn't be affected at all right?
However, I've successfully compiled the branch in Windows 11 Pro 23H2.

[UE4SS]

Since you got a lot of if there, if it runs in wine, I guess windows shouldn't be affected at all right? However, I've successfully compiled the branch in Windows 11 Pro 23H2.

Yeah, for some reason checking against the default value of the option doesn't work so now we're checking if the option isn't msvc-wine to detect non-cross builds.
CI is passing, and msvc-wine works for me on Arch Linux, so this should be good to go, though it would be good if someone else could test this on Linux just to make sure it's working on more machines than mine.

[Buckminsterfullerene02]

I followed the instructions and was able to easily (aside from one error, which was an easy fix and is now in the PR) build the project on arch linux.

I tested the compiled binaries on windows and it works. I tested kismet debugger, pressed the various generator buttons and checked live view, all work as expected.