runtime: Restore copyright notice accidentally removed from mgc0.c.

From-SVN: r215423

diff --git a/libgo/runtime/mgc0.c b/libgo/runtime/mgc0.c
index 6864a83..dda1845 100644 (file)
--- a/libgo/runtime/mgc0.c
+++ b/libgo/runtime/mgc0.c
@@ -1,4 +1,4 @@
-
+// Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.