[wined3d] pbuffer support

[Oliver Stieber]

Hi, 

This patch implements the use of PBuffers for offscreen textures.
The fads in Pirates should now appear fullscreen, the dx9_offscreen_rendering
tutorial has an odd problem with ATI's drivers, clicking the window and moving
the mouse will cause the tutorial to render properly, I haven't found anything
else with this problem yet and I don't currently have a workaround.

Registry entries and options in winecfg to change to enable and disable
pbuffers will be added in a later patch.




	
	
		
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