xaudio2_{7, 8}: Implement IXaudio interface as stub

[Guillaume Charifi]

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

---
 configure                         |   2 +
 configure.ac                      |   1 +
 dlls/xaudio2_7/Makefile.in        |   3 +
 dlls/xaudio2_7/xaudio2.c          | 236
++++++++++++++++++++++++++++++++++++++
 dlls/xaudio2_7/xaudio_classes.idl |  28 +++++
 dlls/xaudio2_7/xaudio_dll.c       |  94 +++++++++++++--
 dlls/xaudio2_7/xaudio_private.h   |  32 ++++++
 dlls/xaudio2_8/Makefile.in        |  10 ++
 dlls/xaudio2_8/xaudio2_8.spec     |   4 +
 9 files changed, 399 insertions(+), 11 deletions(-)
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