Function stbi__sse2_available

include/stb/stb_image.h:754–758

#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++