Add missing licenses

src/test/run-make/hotplug_codegen_backend/some_crate.rs

@@ -1,3 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 fn main() {
     ::std::process::exit(1);
 }

src/test/run-make/hotplug_codegen_backend/the_backend.rs

@@ -1,3 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 #![feature(rustc_private)]
 
 extern crate syntax;
@@ -36,7 +46,7 @@ impl TransCrate for TheBackend {
         _rx: mpsc::Receiver<Box<Any + Send>>
     ) -> Box<Any> {
         use rustc::hir::def_id::LOCAL_CRATE;
-        
+
         Box::new(tcx.crate_name(LOCAL_CRATE) as Symbol)
     }