WGL: WGL_ARB_render_texture speedup

[Roderick Colenbrander]

Hi,

This patch greatly improves the performance of WGL_ARB_render_texture. Before 
I used glReadPixels to copy data from the pbuffer to system memory, later on 
I copied it back to a texture. I knew the real solution was the use of 
glCopyTexImage2D (which saves the gpu->cpu->gpu copying) but I wasn't able to 
get it working partly due to some bugs in the old pbuffer code.

The new code is a lot faster. Some demos have become 5x faster or more! All 
demos still work.

Regards,
Roderick Colenbrander
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