[cairo] Quartz backend revamp

[Andrea Canciani]

I'm working on improving the quartz backend (first of all make it
reasonably pass most/all the test suite).
I already posted some patches (
http://lists.cairographics.org/archives/cairo/2009-August/017925.html
), here is one more.
This patch makes the backend PASS a1-traps-sample and causes no regressions.
Andrea
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