Add missing license header

Author: faern

system-configuration/src/lib.rs

@@ -1,3 +1,11 @@
+// Copyright 2017 Amagicom AB.
+//
+// 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.
+
 #[macro_use]
 extern crate core_foundation;
 extern crate system_configuration_sys;