Since 33d18982 (the commit that
introduced the new bsf API) allocating an enlarged buffer in case
extradata needs to be added to a packet is done via av_new_packet(),
so that libavutil/mem.h is no longer needed.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>