[cairo] [PATCH] Fixes for quartz-image and xlib

[Andrea Canciani]

A fix to make quartz-image compile again and to avoid a double free
issue (happening on MacOSX and probably on all the systems where
HAS_ATOMIC_OPS) is not defined.
The quartz-image fix should obviously be applied (as compiling and
being broken would still be better than not compiling at all).
Reviewing the (one line) fix for xlib fix might be a good idea, as I'm
not really sure what the semantic of the function I'm editing should
be.
Thank you
Andrea Canciani
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