[cairo] server side gradients

[David Reveman]

I've updated my server-side gradient patch for cairo's xlib backend. A
bug in libXrender was avoided in the earlier patch by making a call to
XSync (I didn't know why, back when I wrote that patch). I recently
tracked down this libXrender bug and the patch has been updated with an
appropriate workaround and comments. More info about that bug here
https://bugs.freedesktop.org/show_bug.cgi?id=9526. The buggy_gradient
variable is currently set to TRUE for all servers and should of course
be updated to reflect the servers that support gradients properly.
However, I believe that the patch is good to go in as it is.

This should provide significant performance improvement for the xlib
backend.

- David
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