33d6ca8ac6f253bc2cd5efab9ccf711f951c3170
Hide newer APIs behind features <!-- 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/67) <!-- Reviewable:end -->
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