Remove GL_ARB_imaging requirement

Mesa doesn't have it, and I'm not sure it really
serves any purpose at all.
Ensure SDL_image and SDL_ttf initialize correctly
Fix shader code. Thanks Mesa!

On the other hand, the kind of shit fglrx
just lets through boggles the mind.
Clip text surface to texture bounds on fast upload
Start ifdef'ing out RGSS2 functionality
Add '$ORIGIN/lib' rpath for now
No point in drawing spaces