Win32: work around a 2013 CRT issue with FMA3

The discussion on the ML is still going atm, but since the fix is an easy one I just went ahead and did it. IMO accepting/rejecting a PR reaches more people that care than just posting on the ML, so feel free to discuss further things here.

Tbh. I have no idea how the issue looks like (being on AMD); i just did the typing/commenting/pushing work. However, it seems to be well documented how to work around it (not just on MS Connect, even ector pushed it to PPSSPP).

And, of course, anyone testing it on an affected would be appreciated.