Merge commit '173b5621'

* commit '173b5621':
  lavf: make avio_read_partial() public
  swscale: Do not expand a macro with 'defined' in it
  configure: Include d3d11va_extralibs in libavutil

This commit is a noop, see
69218b41
add7b3bc
5d766747Merged-by: James Almer <jamrial@gmail.com>