add copyright from template

src/test/run-make/git_clone_sha1.sh

@@ -1,5 +1,15 @@
 #!/bin/bash -x
 
+# Copyright 2018 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.
+
 # Usage: $0 project_name url sha1
 # Get the crate with the specified sha1.
 #