[backport][msbuild] Skip reference assemblies passed to mtouch (#3791) #3889
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(Could not AOT the assembly System.Runtime.CompilerServices.Unsafe.dll (MT3001) #3199)
Given a Nuget Package added via the "package reference" mechanism and the said package having netstandard 'lib' and 'ref' folders;
MTouch was getting reference assemblies and was trying to AOT them. This resulted in an error as those assemblies are only facades.
'ResolveNuGetPackageAssets' computes the NuGet packages using their json asset file, adds the full assemblies to 'ReferenceCopyLocalPaths' and outputs the resolved references via '_ReferencesFromNuGetPackages'.
This is exactly what "Microsoft.NuGet.Build.Tasks"'s 'ResolveNuGetPackageAssets' target does.