Update copyright dates (20XY-2012 ==> 20XY-2013)


git-svn-id: svn://svn.valgrind.org/vex/trunk@2792 8f6e269a-dfd6-0310-a8e1-e2731360e62c
diff --git a/priv/main_util.h b/priv/main_util.h
index ce5aa00..7573a20 100644
--- a/priv/main_util.h
+++ b/priv/main_util.h
@@ -7,7 +7,7 @@
    This file is part of Valgrind, a dynamic binary instrumentation
    framework.
 
-   Copyright (C) 2004-2012 OpenWorks LLP
+   Copyright (C) 2004-2013 OpenWorks LLP
       info@open-works.net
 
    This program is free software; you can redistribute it and/or