script, lib/discover: Fixup copyright checks

lib/discover/local_test.go

@@ -1,3 +1,9 @@
+// Copyright (C) 2016 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
 package discover
 
 import (

script/check-copyright.go

@@ -29,6 +29,7 @@ var copyrightRegexps = []string{
 	`Copyright`,
 	`package auto`,
 	`automatically generated by genxdr`,
+	`generated by protoc`,
 }
 
 var copyrightRe = regexp.MustCompile(strings.Join(copyrightRegexps, "|"))