* Remaining feedback from ILLink merge
Move ILLink MSBuild dependencies into Versions.props MSBuild section, and use a consistent MSBuild version
Update the readme from linker to state is a project and not a repository
Uses a live build of ilasm instead of relying on prebuilt bits from Microsoft.NET.Sdk.IL
Remove a unnecesary DefineConstant that is imported via SDK
Avoid having hardcoded package versions
Removes the illink PATENTS.txt, runtime's PATENTS.txt already takes into account Mono given that it has a mono partition