Remove "libmpeg2" bitstream reader
Using the libmpeg2 reader causes errors in a multitude of places,
including MPEG and H264 codecs. As the advantage of this reader
is questionable, removing it seems the sensible course of action,
especially considering the simplifications this allows elsewhere
with the bit cache size increasing from 17 to 25 bits as minimum.
Signed-off-by: Mans Rullgard <firstname.lastname@example.org>
(cherry picked from commit 938f72e19957e9ee3f4ae2bee2fb53ded359009f)