Auto merge of #30 - mbrubeck:libc0.1, r=larsbergstrom
Auto merge of #30 - mbrubeck:libc0.1, r=larsbergstrom

Explicitly depend on libc 0.1

<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/rust-fontconfig/30)
<!-- Reviewable:end -->

mbrubeck/rust-fontconfig