[5/5] winex11: Use an offscreen redirected window for child OpenGL rendering

[Chris Robinson]

This uses XComposite, when available, to render GL to an offscreen window, and 
updates the win32 window when glFlush/glFinish/SwapBuffers is called. When 
rendering to a top-level window with a matching visual, it renders 
directly "onscreen", and setting the registry key
HKCU\Software\Wine\X11 Driver\CompositeGL
to false will disable GL compositing behavior even when XComposite is 
available (default is enabled).
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