xaudio2_7: Implement IXaudio2 interface as stub (try 4)

[Guillaume Charifi]

Fixes https://bugs.winehq.org/show_bug.cgi?id=26808

---
 dlls/xaudio2_7/Makefile.in        |    2 
 dlls/xaudio2_7/xaudio_dll.c       |  300
++++++++++++++++++++++++++++++++++++-
 dlls/xaudio2_7/xaudio_classes.idl |   28 +++
 3 files changed, 319 insertions(+), 11 deletions(-)

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