too many generated files in cppwinrt

[dlech]

For some reason, the -include and -exclude options don't work for cppwinrt.exe like they do for pywinrt.exe, so it ends up generating a bunch of files that we don't need.

[dlech]

This doesn't seem as simple as first glance. The -include and -exclude only apply to components, not the base projection. So I guess we can say it is working as designed. Each file includes many others, so it would be difficult to figure out the dependency tree.