10075 make usr/src/tools smatch clean

*** 22,33 ****
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "%Z%%M% %I%     %E% SMI"
  
  #include <stdlib.h>
  #include <fcntl.h>
  #include <strings.h>
  #include <stdio.h>
  #include <errno.h>
--- 22,36 ----
  /*
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! /*
!  * Copyright (c) 2018, Joyent, Inc.
!  */
  
+ #include <unistd.h>
  #include <stdlib.h>
  #include <fcntl.h>
  #include <strings.h>
  #include <stdio.h>
  #include <errno.h>