Provide rpl_realloc() for systems with broken implementation

+/* rpl_realloc.c -- a replacement for broken realloc implementations
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+   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, or (at your option)
+   any later version.
+
+   This program 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 this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <stdlib.h>
+
+void *
+rpl_realloc(void *ptr, size_t size)
+{
+  if (!ptr)
+    return malloc(size);
+  if (!size)
+    {
+      if (ptr)
+        free(ptr);
+      return malloc(size);
+    }
+  return realloc(ptr, size);
+}