n3.4.14
swscale/arm: add yuv2planeX_8_neon
swscale/arm: add ff_hscale_8_to_15_neon
swscale: NEON optimized unscaled rgba to nv12 conversion
fix build with gas-preprocessor.pl
swscale/arm/yuv2rgb: make the code bitexact with its aarch64 counter part