With one exception: System.Runtime.InteropServices.RuntimeInformation.
For the rest we will no longer ship packages.
Instead the types will be supported as follows:
1. In a netstandard2.0+ project via NETStandard.Library package's
netstandard.dll
2. In a netstandard1.x project via NETStandard.Library package and
closure which ship from servicing branches.
3. In a framework specific project via the framework's targeting pack
or framework package.
