5910 libnisdb won't build with modern GCC

@@ -19,14 +19,19 @@
  * 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
 
 %