Support MENUEX parsing

[XVilka]

Bugzilla Link	40108
Version	trunk
OS	Windows NT
CC	@gregbedwell,@MaskRay,@jeremyd2019,@mstorsjo

Extended Description

See mesonbuild/meson#4105 (comment)

and http://llvm.1065342.n5.nabble.com/llvm-dev-Trying-to-cross-compile-LLVM-runtimes-to-Windows-td123514.html#a123549

So there is clearly a need to support such entries parsing

https://docs.microsoft.com/en-us/windows/desktop/menurc/menuex-resource

[XVilka]

Are there any news about this bug? It is very important for substituting MSVC with clang-cl.

[llvmbot]

I second this, the MENUEX resource type is used in MFC projects as well, so the support of MENUEX is very desirable.

[jeremyd2019]

Ran into this trying to build nsis: https://sourceforge.net/p/nsis/code/HEAD/tree/NSIS/trunk/Contrib/Makensisw/resource.rc