this should've been written earlier, sorry
Signed-off-by: Anton Khirnov <anton@khirnov.net>

This fixes a lot of warnings of the sort:
libavcodec/pcm.c:105: warning: cast discards qualifiers from pointer target type

Automatic stripping of binaries was removed in commit e0be794a
and the _g binaries disappeared along with it.

Use the correct error codes and format identifier.

They've accumulated enough new APIs and corresponding deprecated cruft.

This breaks API and ABI.

The string "FFmpeg" was replaced by "Libav" in metadata that
got encoded in file headers.

The number of dba segments is the coded value + 1.
The coupling dba offset starts at the first coupling band, not at zero.

PROFILE_ADVANCED doesn't set res_fasttx, so make that a special case
in the condition that decides which IDCT to use (and whether to read
coefficients transposed or not).
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>