avcodec/libx265: fill headers in extradata

Fixes Ticket3457

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit dded5ed9c5eb0c3d5a953e661ea21a9019e93ea4)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
1 file changed