[cairo] patch for using XCopyArea when possible

[Vladimir Vukicevic]

The attached patch makes the xlib surface's composite implementation
use XCopyArea when possible; it can probably be used in a few more
cases as well.  Specifically, if there's a 1-bit mask, we can also use
XCopyArea, but that case isn't handled by this patch.

     - Vlad
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