Cleanup native build (dotnet/core-setup#5228)

Cleanup native build (dotnet/core-setup#5228)

Refactor cmake files to avoid code duplication.
Fix comhost to have native resources on Windows - that is version and other properties.
Turn on parallel build on Windows - on my machine the native build took 125 second before and 40 after this change.

Commit migrated from https://github.com/dotnet/core-setup/commit/758461c8933699dca0cb5f8e4fa712ab35d1d277