Skip newly added test on 32bit platforms

That bug didn't affect 32bit platforms, and besides, it is rather
unlikely that allocating a 2GB string works on such platforms.

Author: cmb69

ext/pdo_sqlite/tests/bug81740.phpt

@@ -3,6 +3,7 @@ Bug #81740 (PDO::quote() may return unquoted string)
 --SKIPIF--
 <?php
 if (!extension_loaded('pdo_sqlite')) print 'skip not loaded';
+if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platforms only");
 if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 ?>
 --INI--