Merge remote-tracking branch 'qatar/master'

* qatar/master:
  dnxhddec: avoid a branch in 10-bit decode_dct_block()
  H.264: Add optimizations to predict x86 assembly.
  riff: Add mpgv MPEG-2 fourcc
  add Flash Screen Video 2 decoder

Conflicts:
	configure
	doc/general.texi
	libavcodec/Makefile
	libavcodec/allcodecs.c
	libavcodec/version.h

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