Auto merge of #790 - servo:fitzgen-patch-1, r=emilio
Auto merge of #790 - servo:fitzgen-patch-1, r=emilio

Minimal test cases don't have `#include`s

The inclusion of an `#include` means that the test case

* is not minimal, and
* is harder to reproduce the bug with, since not everyone has the same headers (or versions of headers) on their system.

r? @emilio

emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen