Update copyright headers after acquisition by secunet

src/libstrongswan/utils/lexparser.c

@@ -1,6 +1,8 @@
 /*
  * Copyright (C) 2001-2006 Andreas Steffen
  *
+ * Copyright (C) secunet Security Networks AG
+ *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or (at your