[cairo] patch for using XCopyArea when possible

[Vladimir Vukicevic]

Here's an updated patch, along with three simple compositing tests
that hit all 3 paths inside xlib's composite_surface.  The same tests
are probably applicable to any other backends that want to try to
optimize for this, especially since drawing pixel-aligned fully opaque
images is pretty common in UIs.

     - Vlad
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