lossless_enc_neon: add VP8LTransformColor
lossless_enc_neon: add VP8LTransformColor

based on SSE2, ~32% faster

Change-Id: I76f4d6fe456baceba46ffebf2f699e98691eefdf

yohunl/libwebp,ya7lelkom/libwebp,ttyangf/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,Aexyn/libwebp,yohunl/libwebp,yohunl/libwebp,imazen/libwebp,redengineer/libwebp,imazen/libwebp,ya7lelkom/libwebp,webmproject/libwebp,Aexyn/libwebp,yohunl/libwebp,imazen/libwebp,ttyangf/libwebp,webmproject/libwebp,zofuthan/libwebp,redengineer/libwebp,zofuthan/libwebp,webmproject/libwebp,redengineer/libwebp,ya7lelkom/libwebp,redengineer/libwebp,ttyangf/libwebp,Aexyn/libwebp,Aexyn/libwebp,webmproject/libwebp,redengineer/libwebp,imazen/libwebp,Aexyn/libwebp,zofuthan/libwebp,ttyangf/libwebp,ya7lelkom/libwebp,zofuthan/libwebp,zofuthan/libwebp,PKRoma/libwebp,yohunl/libwebp,ya7lelkom/libwebp,imazen/libwebp,ttyangf/libwebp,webmproject/libwebp,PKRoma/libwebp