Merge from the trunk revs. 4790, 4807, 4809, 4815, 4816 and
4817 by wavael to fix some embarassing issues in dxva2api.h:
* dxva2api.h (Direct3DDeviceManager9): Fix COBJMACROS to use lpVtbl.
  (DirectXVideoDecoder): Likewise.
  (DirectXVideoAccelerationService): Likewise.
  (DirectXVideoDecoderService): Likewise.
  (DXVA2_E_NOT_INITIALIZED): Add missing error code.
  (DXVA2_E_NEW_VIDEO_DEVICE): Likewise.
  (DXVA2_E_VIDEO_DEVICE_LOCKED): Likewise.
  (DXVA2_E_NOT_AVAILABLE): Likewise.
  (DXVA2_ConfigPictureDecode): Change type from UINT to USHORT (msdn
  documentation is incorrect.)
* dxva2api.h: Remove global packing directives and pack only the
  DXVA_FilmGrainChar_H264, DXVA_SliceInfo and DXVA_Slice_H264_Short
  structures.

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/stable/v2.x@4831 4407c894-4637-0410-b4f5-ada5f102cad1