Add instructions for building on Windows on ARM.

[andrewachen]

Mostly figured out via Claude. Tested on Windows 11 Pro 24H2 26100.4946.

[RamonUnch]

Very nice, Thanks for your effort,

I have a small question regarding the WinMain.
unfuckWinMain simply calls tWinMain with corrects parameters. I guess you cannot get rid of the CRT in ARM mode and thus cannt use -nostdlib.

It seems you use the ANSI WinMain entrypoint, it does not really matter in your case because all parameters are ignored.
To forec gcc to take the Unicode entry point wWinMain() you can use the -municode parameter. AltSnap.c defines tWinMain which is simply is a generic alias for both unicode and ANSI.

So in short I believe that you could remove the wrapper and add to gcc the parameters
-DtWinMain=wWinMain and -municode.

[andrewachen]

Thanks for the feedback -- that does work. I've updated the PR with those changes.

[RamonUnch]

Nice!