It seems Cecil doesn't search next to the current assembly for any assembly
references, which means that it may fail to resolve assemblies in certain
circumstances:
Failed files
Expected: <empty>
But was:
Failed to process /work/maccore/xcode10/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/lib/mono/2.1/OpenTK.dll: Failed to resolve assembly: 'monotouch, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'
Failed to process /work/maccore/xcode10/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/lib/mono/Xamarin.TVOS/OpenTK-1.0.dll: Failed to resolve assembly: 'Xamarin.TVOS, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'
Failed to process /work/maccore/xcode10/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/lib/mono/Xamarin.iOS/OpenTK-1.0.dll: Failed to resolve assembly: 'Xamarin.iOS, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'"
However, Cecil does search the current directory by default, so before loading
any assemblies, change the current directory to the directory of the assembly
we're loading.
Fixes https://github.com/xamarin/xamarin-macios/issues/4241.
ddd7d4cc19