* qatar/master:
FATE: add a 24-bit FLAC encoding test
FATE: rename FLAC tests from flac-* to flac-16-*
flacenc: use RICE2 entropy coding mode for 24-bit
flacenc: add 24-bit encoding
flacdsp: move lpc encoding from FLAC encoder to FLACDSPContext
Merged-by: Michael Niedermayer <michaelni@gmx.at>