Merge commit '5cc0057f'

* commit '5cc0057f':
  lavu: remove the custom atomic API

This commit is a noop. The removal is postponed until all usages in
FFmpeg are dropped as well. A patchset is on discussion on the
mailing-list:
http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209003.htmlMerged-by: Clément Bœsch <u@pkh.me>

doc/libav-merge.txt

@@ -95,6 +95,7 @@ Stuff that didn't reach the codebase:
   - 0cef06df0 checkasm: add HEVC MC tests
   - e7078e842 hevcdsp: add x86 SIMD for MC
 - VAAPI VP8 decode hwaccel (currently under review: http://ffmpeg.org/pipermail/ffmpeg-devel/2017-February/thread.html#207348)
+- Removal of the custom atomic API (5cc0057f49, see http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209003.html)
 
 Collateral damage that needs work locally:
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