Use MyISAM engine for new test

Travis on 7.3 is showing this error:

> The size of BLOB/TEXT data inserted in one transaction is greater
> than 10% of redo log size. Increase the redo log size using
> innodb_log_file_size.

Force MyISAM engine to avoid this.

Author: nikic

ext/mysqli/tests/mysqli_real_connect_compression_error.phpt

@@ -26,7 +26,7 @@ $data_size = 16777174;
 $mysqli = mysqli_init();
 $result = my_mysqli_real_connect($mysqli, $host, $user, $passwd, $db, $port, $socket);
 $mysqli->query("DROP TABLE IF EXISTS test");
-$mysqli->query("CREATE TABLE test (`blob` LONGBLOB NOT NULL)");
+$mysqli->query("CREATE TABLE test (`blob` LONGBLOB NOT NULL) ENGINE=MyISAM");
 
 $data = str_repeat("x", $data_size);
 $mysqli->query("INSERT INTO $db.test(`blob`) VALUE ('$data')");