For consistency prepare DCOM-interfaces for C.  Nevertheless this header is still unusable due it requires further definitions from Atl/Afx, which aren't part of our header-set.


git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6494 4407c894-4637-0410-b4f5-ada5f102cad1
Adjust INTERFACEs for C


git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6495 4407c894-4637-0410-b4f5-ada5f102cad1