Try test for PHP 7.4, LANG-CHARSET missing

Author: onli

tests/include/bundledLibsTest.php

@@ -2,6 +2,7 @@
 
 @define('S9Y_PEAR_PATH', dirname(__FILE__) . '/../../bundled-libs/');
 @define('IN_serendipity', true);
+@define('LANG_CHARSET', 'UTF-8');
 require_once dirname(__FILE__) . '/../../include/compat.inc.php';
 if (!class_exists('XML_RPC_Base')) {
     include_once(S9Y_PEAR_PATH . "XML/RPC.php");