code review 4609047: syscall: use strict in perl scripts

src/pkg/syscall/mksysnum_darwin.pl

 #!/usr/bin/perl
 # Copyright 2009 The Go Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 #
 # Generate system call table for Darwin from sys/syscall.h
 
 use strict;
-use warnings;
 
 my $command = "mksysnum_darwin.pl " . join(' ', @ARGV);
 
 print <<EOF;
 // $command
 // MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
 
 package syscall
 
 const (
 EOF
 
 while(<>){
         if(/^#define\s+SYS_(\w+)\s+([0-9]+)/){
                 my $name = $1;
                 my $num = $2;
                 $name =~ y/a-z/A-Z/;
                 print " SYS_$name = $num;"
         }
 }
 
 print <<EOF;
 )
 EOF