5910 libnisdb won't build with modern GCC

*** 19,32 ****
--- 19,38 ----
   * CDDL HEADER END
   */
  /*
   *      db_mindex_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"
+ %#include "nis_clnt.h"
+ #endif /* RPC_XDR */
+ 
  #if RPC_HDR
  %#ifndef _DB_MINDEX_H
  %#define _DB_MINDEX_H
  
  #ifdef USINGC
*** 87,97 ****
          nis_object      *obj;
          strP            dirEntry<>;
  };
  typedef struct xdr_nis_object_s xdr_nis_object_t;
  
- %extern bool_t  xdr_nis_object();
  #endif /* USINGC */
  #endif /* RPC_HDR */
  
  #ifndef USINGC
  #ifdef RPC_HDR
--- 93,102 ----
*** 104,115 ****
  %               char    **dirEntry_val;
  %       }                               dirEntry;
  %};
  %typedef struct xdr_nis_object_s        xdr_nis_object_t;
  %
- %extern bool_t  xdr_nis_object();
- %
  %class db_mindex {
  %  vers rversion;
  %//  int num_indices;
  %//  db_index * indices;                /* indices[num_indices] */
  %  struct {
--- 109,118 ----