Update prebuilts to go1.7rc1 ab/3043704

toolchain/go sha ffb9ee3a

Change-Id: Id13cc2f426fd6d4e53bde9b50251fb264a647f47
diff --git a/src/cmd/vet/buildtag.go b/src/cmd/vet/buildtag.go
index 2d86edf..ccf764e 100644
--- a/src/cmd/vet/buildtag.go
+++ b/src/cmd/vet/buildtag.go
@@ -1,4 +1,4 @@
-// Copyright 2013 The Go Authors.  All rights reserved.
+// Copyright 2013 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.