Fix fake sceFontGetCharGlyphImage() overflowing

This gets VC2 farther (hangs on loading) and takes Senjou no Valkyria 3 in game.  Could be properly implemented/loading the kernel module, but this just fixes overflowing the game code's buffer.

It's got some bugs, but Senjou no Valkyria 3 looks *better* in PPSSPP than JPCSP.  A lot of things that aren't drawn properly in JPCSP are properly drawn in PPSSPP, etc.  Really cool.

But there's some bug going on in semaphores, or else some bug affecting them - I got a semaphore with 16k waiting threads.  Still have to debug that.

-[Unknown]