Add FFMPEG_VERSION into the binary libs

This simplifies identifying from which revision a binary of a lib came from

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
x86/constants: fix alignment of pw_255

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/mpegvideo_enc: remove rtp_mode=0 for H261

Suggested-by: Thomas Volkert <silvo@gmx.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/vp3: Fix offset handling

Fixes use of uninitialized memory

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