Remove NetBSD getopt dependency to unistd.h.

- Remove the $NetBSD header as it wouldn't get updated and is wrong.

src/extras/getopt.c

@@ -1,5 +1,3 @@
-/*	$NetBSD: getopt_long.c,v 1.4 2011/09/07 00:56:17 joerg Exp $	*/
-
 /*-
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -85,6 +83,12 @@ static const char illoptstring[] = "illegal option -- %s";
 
 static const char *progname;
 
+/* These are used to replace unistd.h include. */
+char *optarg = 0;
+int optind = 0;
+int opterr = 0;
+int optopt = 0;
+int optreset = 0;
 
 /* Replacement for warnx(3) for systems without it. */
 static void xwarnx(const char *fmt, ...) {

src/extras/getopt.h

@@ -1,5 +1,3 @@
-/*	$NetBSD: getopt.h,v 1.9 2014/09/11 21:48:34 jperkin Exp $	*/
-
 /*-
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -32,7 +30,9 @@
 #ifndef _GETOPT_H_
 #define _GETOPT_H_
 
-#include <unistd.h>
+/* These are used to replace unistd.h include. */
+extern char *optarg;
+extern int optind, opterr, optopt, optreset;
 
 /*
  * Gnu like getopt_long() and BSD4.4 getsubopt()/optreset extensions