php security, bug fix and enhancement update

5.3.3-22 - php-xml provides php-xmlreader and php-xmlwriter 874987 - fix possible NULL derefence and buffer overflow 879179 - fix zend garbage collector 848186, 868375 5.3.3-21 - fix CVE reference in previous changelog entry 5.3.3-20 - remove reproducer from security fix for CVE-2012-0781 5.3.3-1...