* commit 'd8c772de':
  nutdec: Always return a value from nut_read_timestamp()
  configure: Make warnings from -Wreturn-type fatal errors
  x86: ABS2: port to cpuflags
  vdpau: Remove av_unused attribute from function declaration
  h264: fix ff_generate_sliding_window_mmcos() prototype.

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