Forbid dead code again

The old problems with bitflags no longer apply

Author: asomers

src/lib.rs

@@ -5,9 +5,6 @@
 #![crate_name = "nix"]
 #![cfg(unix)]
 #![allow(non_camel_case_types)]
-// latest bitflags triggers a rustc bug with cross-crate macro expansions causing dead_code
-// warnings even though the macro expands into something with allow(dead_code)
-#![allow(dead_code)]
 #![cfg_attr(test, deny(warnings))]
 #![recursion_limit = "500"]
 #![deny(unused)]