5910 libnisdb won't build with modern GCC

*** 18,33 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*
   * DESCRIPTION: Contains utilities relating to TTL calculation.
   */
  #include <unistd.h>
  #include <syslog.h>
--- 18,32 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2015 Gary Mills
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
   * DESCRIPTION: Contains utilities relating to TTL calculation.
   */
  #include <unistd.h>
  #include <syslog.h>
*** 283,293 ****
   *
   */
  suc_code
  add_to_timeval(struct timeval *t1, int t2)
  {
-         long usec;
          struct timeval oldval;
  
          oldval.tv_sec = t1->tv_sec;
  
          /* Add seconds part */
--- 282,291 ----