Flush to show results of TestLib.pm (TAP) test as we go.

It appears that some attempt was made to do this using autocommit,
but it wasn't effective (at least on Ubuntu 14.04).

src/test/perl/SimpleTee.pm

@@ -20,6 +20,7 @@ sub PRINT {
 	my $ok = 1;
 	for my $fh (@$self) {
 		print $fh @_ or $ok = 0;
+		$fh->flush or $ok = 0;
 	}
 	return $ok;
 }