MPEG4和H264的ARMV6汇编优化,效率很高的-MPEG4 and H264 of ARMV6 compilation optimization, high efficiency

使用arm 汇编，实现yuv 转rgb的快速转换的patch，用于ffmepg 1.0版本的libswscale库。- Using the arm assembly to achieve rapid conversion yuv rgb turn the patch, for ffmepg 1.0 version of the libswscale library.