modify rtcd_defs.sh: in first step, simd just include mmx; no include sse*
modify rtcd_defs.sh: in first step, simd just include mmx; no include sse*

huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips,huangwenjun06/libvpx_mips