2/3 winex11: add X11DRV_XRender_SetDeviceClipping

[Roderick Colenbrander]

Hi,

The last couple of XRender patches focus on reusing XRender pictures.
When using a cached picture the clipping region might change. For this
add a new helper function to update the XRender clipping region when
the clipping region changes. Since X11DRV_SetDeviceClipping (which
calls X11DRV_XRender_SetDeviceClipping) can get called before xrender
is used, also set the clipping region during when a picture is
allocated. I could also let X11DRV_SetDeviceClipping call xrender all
the time to set xrender up but we might not always use xrender, so
this way it is only set when really needed.

Regards,
Roderick Colenbrander
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