Sin/cos fix for hardfp builds.
Avoid shrinking buffer w/h in throughmode.

Since they could overdraw and we already scissor.
Merge pull request #6315 from unknownbrackets/framebuf-estimate

Avoid shrinking buffer w/h in throughmode
Merge branch 'hardfp' of github.com:xsacha/ppsspp into xsacha-hardfp