gfx: Mode 7 fixes and optimisations #9
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Backport mode 7 fixes and optimisations from snes9x-1.41, in particular the fixed clipping also drops the modulo 1023 in favour of bit- manipulation which removes a long multiplication. Backport dropping of the game-specific fix from snes9x-1.42.
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I've used this on top of #6 and created a PGOed binary (with a mode 7 game, leaving it to run the demo) but it still doesn't beat the performance of your binary but then there's a quite a bit of run-to-run variance (as much as 30%) so it's hard to tell.