pfPorts: PHP 5.3.21 (sync with FreeBSD ports r310837)

Sync with FreeBSD ports to get PHP 5.3.21.

All previous pfSense-added patches still apply cleanly. For more detailed
description about our local modifications, check the PHP 5.3.19 commit.

According to the changelogs, this sounds like a rather minor release,
some cURL bugs mostly, the parallel 5.4 update received more changes.