remove lib32/xaudio*.def and lib64/xaudio*.def. remove all xaudio import library
builds from the Makefiles.


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6271 4407c894-4637-0410-b4f5-ada5f102cad1
Updated headers imported from Wine.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6274 4407c894-4637-0410-b4f5-ada5f102cad1
Regenerated headers from IDLs.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6275 4407c894-4637-0410-b4f5-ada5f102cad1