Merge remote-tracking branch 'qatar/master'

* qatar/master:
  x86: fix build with nasm 2.08
  x86: use nop cpu directives only if supported
  x86: fix rNmp macros with nasm
  build: add trailing / to yasm/nasm -I flags
  x86: use 32-bit source registers with movd instruction
  x86: add colons after labels

Conflicts:
	Makefile
	libavutil/x86/x86inc.asm

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