Detect Peace Walker's anti-cheat hash func

This replaces the func with one that ignores emuhacks.  The demo calls this func often.

This makes the demo work, despite #3365.  Not sure if we should consider it fixed?  Anyway, it seems like I could make this func return whatever I want, and it'd be fine; the important thing is it doesn't ever change for the same code.

I know that #2845 doesn't seem to be caused by jit, but I don't know if the full game employs any of this anti-cheat stuff.  Not sure if the func exists there or has the same signature.  I'm assuming it does.

-[Unknown]