Merge commit 'da60b99a'

* commit 'da60b99a':
  ppc: Restrict some Altivec implementations to Big Endian

Conflicts:
	libavcodec/ppc/huffyuvdsp_altivec.c
	libavcodec/ppc/me_cmp.c

Not merged, our PPC64LE fate clients passed all tests last time they did run
Merged-by: Michael Niedermayer <michaelni@gmx.at>