[php-src] Issue #11904: exec began setting exit_status to -1 starting with 8.1.22

Issue: https://github.com/php/php-src/issues/11904 Author: JaggedJax ### Description The following code: ```php <?php $exit_status = 255; $output = []; $to_execute = 'ssh scheduler@job.server "php test_script.php"'; exec((string)$to_execute." 2>&1", $output, $exit_status); ``` Resulted in this output: $exit_status === -1 But I expected this output instead: $exit_status is between 0 and 255. This started happening immediately upon upgrading from PHP 8.1.21 to 8.1.22 with no changes to the existing code. This script is using signal processing as well. I will see if I can create a minimal script to reliably recreate this issue and update here, but I wanted to get the discussion started in case anyone else started seeing this happen. I wonder if this could be related to https://github.com/php/php-src/issues/11498 which went out in 8.1.22 ### PHP Version PHP 8.1.22 ### Operating System Rocky Linux 8.8