do not print setup() arguments by default

mmdebstrap

@@ -552,6 +552,7 @@ sub run_apt_progress {
 sub setup {
     my $options = shift;
 
+    if (0) {
 	foreach my $key (sort keys %{$options}) {
 	    my $value = $options->{$key};
 	    if (!defined $value) {
@@ -565,6 +566,7 @@ sub setup {
 		die "unknown type";
 	    }
 	}
+    }
 
     my ($conf, $tmpfile) = tempfile(UNLINK => 1) or die "cannot open apt.conf: $!";
     print $conf "Apt::Architecture \"$options->{nativearch}\";\n";