[php-src] PR #25260: Fix zend_mm_chunk_alloc_mmap_failure.phpt after OOM became abort()

Pull Request: https://github.com/php/php-src/pull/25260 Author: Marti2203 Fixes the zend_mm_chunk_alloc_mmap_failure.phpt failure reported in GH-25237. The test came with GH-24542, which targeted PHP-8.4. There, zend_out_of_memory() exits with status 1. On master it calls abort() since GH-22637, so run-tests.php appends Termsig=6 after Out of memory, and the expectation did not allow it. The test only runs on non-PIE builds, so CI skips it and the failure did not show up there. The expectation now accepts Out of memory followed by Termsig=6, or allocation succeeded. I checked the new pattern against both outputs; the old one rejects the abort output. PHP-8.4 and PHP-8.5 still exit with status 1, so they need no change. Sorry for the breakage, I should have checked the test on master before it was merged up.