OpenGL: WGL_ARB_render_texture support

[Roderick Colenbrander]

Hi,

This patch adds basic WGL_ARB_render_texture support. It is implemented using 
glReadPixels which isn't great performance wise but it works at an acceptable 
speed. Without this patch lots of demos crash (as in winedbg crash) and with 
it most demos work, so I think it is already a big improvement.

Regards,
Roderick Colenbrander
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