Fix #2533 by making cppwinrt a private dependency (#2535)
Fix #2533 by making cppwinrt a private dependency (#2535)

Fixes #2533
cppwinrt is a build-time dependency for WinObjC. The dependency should
not propagate to other projects that depend on WinObjC.
ehren/WinObjC,nathpete-msft/WinObjC,bbowman/WinObjC,nathpete-msft/WinObjC,bbowman/WinObjC,pradipd/WinObjC,pradipd/WinObjC,nathpete-msft/WinObjC,ehren/WinObjC,pradipd/WinObjC,nathpete-msft/WinObjC,bbowman/WinObjC,bbowman/WinObjC,ehren/WinObjC,bbowman/WinObjC,nathpete-msft/WinObjC,ehren/WinObjC,pradipd/WinObjC,ehren/WinObjC,pradipd/WinObjC