df74138ac1f5e5204c701ad44eb81a3cfb8fbd41
Add bindings needed by Pathfinder The bulk of this consists of `CGPath` routines, which I needed in Pathfinder 2. r? anyone <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-graphics-rs/100) <!-- Reviewable:end -->
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