[php-src] PR #24166: phar: Fix double-free in webPhar() without PATH_INFO

Pull Request: https://github.com/php/php-src/pull/24166 Author: bukka In the CGI/FastCGI branch of webPhar(), when SCRIPT_NAME is present but PATH_INFO is absent, path_info was aliased to the testit buffer and free_pathinfo was set. Since commit 3ee2f442d20 added an unconditional efree(testit) after that branch, path_info became a dangling pointer. This causes a use-after-free when path_info is read later and a double-free at the cleanup_skip_entry label where free_pathinfo triggers efree(path_info). This only affects PHP-8.6 as earlier branches do not free testit there. Allocate a dedicated copy for path_info so its lifetime outlives the efree(testit). Reported by RigelYoung.