Merge commit '0cf86fabfa5820596cca2cfead63c6f8df76c3f2'

* commit '0cf86fabfa5820596cca2cfead63c6f8df76c3f2':
  vaapi_encode: Write sequence header as extradata

This commit is a noop. It has already been cherry-picked in
51020adcecf4004c1586a708d96acc6cbddd050a

Merged-by: James Almer <jamrial@gmail.com>