Fix for bitflags!, refs rust-lang/rust#21254

Author: fantix

Cargo.toml

@@ -7,3 +7,6 @@ authors     = ["Carl Lerche <me@carllerche.com>"]
 homepage    = "https://github.com/carllerche/nix-rust"
 license     = "MIT"
 exclude     = [".gitignore", ".travis.yml", "tests/**/*"]
+
+[dependencies]
+bitflags = "0.1"

src/lib.rs

@@ -3,6 +3,7 @@
 #![feature(linkage)]
 #![allow(unstable)]
 #![allow(non_camel_case_types)]
+#[macro_use] extern crate bitflags;
 
 extern crate libc;
 extern crate core;