This patch applies same changes as commit e3dfef8e3c of libav:
instead of the obsolete AVBitStreamFilterContext now the new AVBSFContext filter is used to
restore annex-B prefixes.
Based-on: e3dfef8e3c by Anton Khirnov
Push requested by maintainer
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>