[php-src] PR #24175: Fix use-after-free when pclose() closes a stream from its user filter

Pull Request: https://github.com/php/php-src/pull/24175 Author: EdmondDantes While a user filter's filter() runs, its stream carries PHP_STREAM_FLAG_NO_FCLOSE, so fclose() from the callback fails with a warning. pclose() did not check the flag: it freed the stream and the filter under the running callback (use-after-free under Valgrind, no Fibers needed). pclose() now refuses such a stream with the same warning as fclose() and returns -1, its documented error value. One visible change: pclose() of an opendir() handle, which also carries the flag, now fails the way fclose() of it already does. Test: ext/standard/tests/filters/pclose_in_filter.phpt.