Fix memory leak when destroying PDORow

This should call zend_object_std_dtor() to clean the property table etc.
This also has a semantic influence because previously weak refs were not
notified for example.

This fixes the final issue in GH-18114 (the crash was master-only and
fixed already).

Closes GH-18114.
Closes GH-18123.

ext/pdo_sqlite/tests/gh18114.phpt

@@ -0,0 +1,19 @@
+--TEST--
+GH-18114 (pdo lazy object crash)
+--EXTENSIONS--
+pdo_sqlite
+--FILE--
+<?php
+$db = new PDO('sqlite::memory:');
+$x = $db->query('select 1 as queryString');
+$data = $x->fetch(PDO::FETCH_LAZY);
+foreach ($data as $entry) {
+    var_dump($entry);
+}
+var_dump((array) $data);
+echo "Done\n";
+?>
+--EXPECT--
+array(0) {
+}
+Done