Win32 crash fix: Don't execute the 0x0B CPUID code on non-Core i CPUs.

Apparently checking for 0x0B isn't enough on Core 2 Duos, so check the brand string, too. If there's a better way to prevent non Core-i CPUs from executing this, please chime in. Checking max_std_fn isn't enough.

Should fix https://github.com/hrydgard/ppsspp/issues/4229.