Merge remote-tracking branch 'qatar/master'

* qatar/master:
  sparc: Eliminate dead code in VIS acceleration macros
  flacdec: drop unnecessary assert
  mjpegdec: properly report unsupported disabled features

Conflicts:
	libavcodec/flacdec.c
	libavcodec/mjpegdec.c

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