Add missing copyright and license notice.

lwlib/xlwmenu.h

+/* Interface of a lightweight menubar widget.
+   Copyright (C) 2000, 2002, 2004  Free Software Foundation, Inc.
+
+This file is part of the Lucid Widget Library.
+
+The Lucid Widget Library 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, or (at your option)
+any later version.
+
+The Lucid Widget Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
 #ifndef _XlwMenu_h
 #define _XlwMenu_h
 

lwlib/xlwmenuP.h

+/* Internals of a lightweight menubar widget.
+   Copyright (C) 1999, 2000, 2002, 2004  Free Software Foundation, Inc.
+
+This file is part of the Lucid Widget Library.
+
+The Lucid Widget Library 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, or (at your option)
+any later version.
+
+The Lucid Widget Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
 #ifndef _XlwMenuP_h
 #define _XlwMenuP_h