needless declarations (#2794)

* needless declarations

* fix build

* needless annotations

Author: tshepang

bindgen-integration/build.rs

@@ -1,5 +1,4 @@
 extern crate bindgen;
-extern crate cc;
 
 use bindgen::callbacks::{
     DeriveInfo, IntKind, MacroParsingBehavior, ParseCallbacks,

bindgen-integration/src/lib.rs

@@ -12,7 +12,6 @@ use std::ffi::CStr;
 use std::mem;
 use std::os::raw::c_int;
 
-#[allow(unused)]
 use bindings::testing::Bar; // This type is generated from module_raw_line.
 
 type MacroInteger = isize;