Merge commit '172b2cee'

* commit '172b2cee':
  dxva2: Add ifdefs around structs that might not be available

Conflicts:
	libavcodec/dxva2.c

See: 94d07b31Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/dxva2.c

@@ -135,7 +135,9 @@ int ff_dxva2_common_end_frame(AVCodecContext *avctx, AVFrame *frame,
 #if CONFIG_D3D11VA
     D3D11_VIDEO_DECODER_BUFFER_DESC buffer11[4];
 #endif
+#if CONFIG_DXVA2
     DXVA2_DecodeBufferDesc          buffer2[4];
+#endif
     DECODER_BUFFER_DESC             *buffer = NULL, *buffer_slice = NULL;
     int result, runs = 0;
     HRESULT hr;