Apparently, some build environments require dxva.h even for dxva2, while others lack this header entirely. Including it conditionally allows building in both cases. Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Mans Rullgard <mans@mansr.com>
Originally committed as revision 21407 to svn://svn.ffmpeg.org/ffmpeg/trunk