build: Add missing replaygain object file for CAF demuxer
build: Add missing object files for Matroska demuxer
build: Add missing object files for webm muxer
build: Have the eatqi decoder depend on the MPEG-1 decoder

eatqi uses more than just the shared mpegvideo bits.
build: Record explicit dependency of intrax8 on error resilience
configure: Drop stray error resilience dependencies
mpeg: Mark ff_mpeg_set_erpic() static

It is not used outside of the file.