[php-src] Issue #11513: phpsessionclean.service displays a rogue WARNING on syslog

Issue: https://github.com/php/php-src/issues/11513 Author: ProceduralMan ### Description As documented on [manual](https://www.php.net/manual/en/sodium.installation.php) "As of PHP 7.2.0 this extension is bundled with PHP. " Consistent with this, extension on php.ini is commented... ;extension=sodium ...while php -i shows support ``` sodium sodium support => enabled libsodium headers version => 1.0.18 libsodium library version => 1.0.18 ``` A bug -I guess- in the startup code is causing a warning to appear on syslog: ``` Jun 23 10:39:03 dev systemd[1]: Starting Clean php session files... Jun 23 10:39:03 dev sessionclean[69737]: PHP Warning: PHP Startup: Unable to load dynamic library 'sodium' (tried: /usr/lib/php/20210902/sodium (/usr/lib/php/20210902/sodium: cannot open shared object file: No such file or directory), /usr/lib/php/20210902/sodium.so (/usr/lib/php/20210902/sodium.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Jun 23 10:39:03 dev systemd[1]: phpsessionclean.service: Deactivated successfull ``` ### PHP Version 8.1.2-1ubuntu2.11 ### Operating System Ubuntu 22.04