use Getopt::Long safely

 * see http://d.hatena.ne.jp/tagomoris/20120918/1347991165

diff --git a/misc/httpbench.pl b/misc/httpbench.pl
index fc5a218..c36ed64 100755 (executable)
--- a/misc/httpbench.pl
+++ b/misc/httpbench.pl
@@ -4,7 +4,7 @@ use strict;
 use warnings;
 use utf8;
 
-use Getopt::Long;
+use Getopt::Long qw(:config posix_default no_ignore_case gnu_compat);
 use Parallel::ForkManager;
 use LWP::Simple;
 use Time::HiRes qw(sleep);