[php-src] Issue #18741: timezone_identifiers_list(DateTimeZone::ALL_WITH_BC) Invalid timezones

Issue: https://github.com/php/php-src/issues/18741 Author: blaaat ### Description The following code: ```php <?php foreach (timezone_identifiers_list(DateTimeZone::ALL_WITH_BC) as $zone) { $timezone = new DateTimeZone($zone); } ``` Resulted in this output: ``` PHP Fatal error: Uncaught DateInvalidTimeZoneException: DateTimeZone::__construct(): Unknown or bad timezone (leapseconds) in /root/a.php:3 Stack trace: #0 /root/a.php(3): DateTimeZone->__construct('leapseconds') ``` But I expected this output instead: ``` no error ``` my timezone_identifiers_list(DateTimeZone::ALL_WITH_BC) includes invalid timezones: - leapseconds - tzdata.zi On a Rocky9 installation with php installation from remi repo: 8.3.21-1.el9.remi ### PHP Version ```plain PHP 8.3.21 (cli) (built: May 6 2025 13:58:10) (NTS gcc x86_64) Copyright (c) The PHP Group Zend Engine v4.3.21, Copyright (c) Zend Technologies with Zend OPcache v8.3.21, Copyright (c), by Zend Technologies ``` ### Operating System Rocky Linux release 9.5 (Blue Onyx)