5910 libnisdb won't build with modern GCC

@@ -17,25 +17,29 @@
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
+
 /*
+ * Copyright 2015 Gary Mills
+ */
+
+/*
  * This is a non-recursive version of XDR routine used for db_index_entry
  * type.
  */
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <sys/types.h>
 #include <sys/syslog.h>
 #include <stdio.h>
 #include <rpc/types.h>
 #include <rpc/xdr.h>
 #include <memory.h>
 #include "db_index_entry_c.h"
 #include "db_table_c.h"
+#include "xdr_nullptr.h"
 
 bool_t
 xdr_db_index_entry(xdrs, objp)
         register XDR *xdrs;
         db_index_entry *objp;