Function stbi__sse2_available

lite/example/cpp_example/mge/cv/stb_image.h:779–782

#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
static int stbi__sse2_available(void) {
    int info3 = stbi__cpuid3();
    return ((info3 >> 26) & 1) != 0;
}
#endif

#else  // assume GCC-style if not VC++