builds for Android
Some assembly optimizations for ARM NEON
added arm optimized dsputil
enabled ARM NEON optimized epel
Merge branch 'rext_new_mc' into hevc_arm

Conflicts:
	libavcodec/arm/dsputil_arm.h
	libavcodec/arm/dsputil_init_arm.c
	libavcodec/arm/dsputil_init_neon.c
	libavutil/arm/asm.S