Merge commit 'f9e7a2f9'

* commit 'f9e7a2f9':
  dxva: add support for new dxva2 and d3d11 hwaccel APIs
  dxva: move d3d11 locking/unlocking to functions
  dxva: preparations for new hwaccel API
  lavc: set avctx->hwaccel before init
  lavu: add new D3D11 pixfmt and hwcontext

This commit is a noop, see
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70143a39Merged-by: James Almer <jamrial@gmail.com>