Add decoder dependency to the HEVC parser.

Fixes compilation with --disable-everything --enable-parser=hevc
Add a Makefile rule for the little-endian G.726 decoder.

Fixes compilation with --disable-everything --enable-decoder=adpcm_g726le
Add a lavc Makefile dependency for the elbg filter.

Fixes compilation with --disable-encoders

Reported by trac user Julian in ticket #3140.
avcodec/pcm-dvd: fix 20bit 2 channels

Fixes part of ticket3122

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/pcm-dvd: fix 20/24bit 1 channel

Fixes part of ticket3122

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/pcm-dvd: fix incorrectly printed warning about changed block sizes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/pcm-dvd: print actual block size values in block size changed warning

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