Replace class List_Node with class KeywordExt.

src/keyword-list.cc

@@ -0,0 +1,29 @@
+/* Keyword list.
+
+   Copyright (C) 1989-1998, 2000, 2002 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>.
+
+This file is part of GNU GPERF.
+
+GNU GPERF 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 1, or (at your option)
+any later version.
+
+GNU GPERF 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 GPERF; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111, USA.  */
+
+#include <stddef.h>
+#include "keyword-list.h"
+
+/* Constructor.  */
+KeywordExt_List::KeywordExt_List (const char *s, int s_len, const char *r)
+  : KeywordExt (s, s_len, r), cdr (NULL)
+{
+}