[cairo] Leak caused by quartz not implementing release_source_image

[Boris Zbarsky]

The image surface that _cairo_quartz_surface_acquire_source_image creates never 
seems to be released, probably because there is no release_source_image callback 
in the quartz code.

The attached patch fixes that problem, at least insofar as the image surface 
itself is no longer leaking.  I'm not sure whether any other cleanup needs to 
happen here.

-Boris

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