* qatar/master:
  riff: Add SVQ3 fourcc
  fate: ac3: add 4.0 and downmix tests
  configure: x86: improve ebp availability check
  vorbisdec: ensure FASTDIV denominator is never 1
  avformat: refactor avformat_close_input
  avformat: simplify avformat_close_input

Conflicts:
	configure
	libavcodec/vorbisdec.c
	libavformat/utils.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>