5910 libnisdb won't build with modern GCC

*** 19,32 ****
--- 19,37 ----
   * CDDL HEADER END
   */
  /*
   *      db_index_c.x
   *
+  *  Copyright 2015 Gary Mills
   *  Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   *  Use is subject to license terms.
   */
  
+ #if RPC_XDR
+ %#include "ldap_xdr.h"
+ #endif /* RPC_XDR */
+ 
  #if RPC_HDR
  %#ifndef _DB_INDEX_H
  %#define _DB_INDEX_H
  
  %