apache: security update to 2.2.22.

apache: security update to 2.2.22.

Fix six low and moderate security flaws. Most of them are not important for ipfire.
low: mod_setenvif .htaccess privilege escalation CVE-2011-3607
low: mod_log_config crash CVE-2012-0021
low: scoreboard parent DoS CVE-2012-0031
moderate: mod_proxy reverse proxy exposure CVE-2011-4317
moderate: error responses can expose cookies CVE-2012-0053
moderate: mod_proxy reverse proxy exposure CVE-2011-3368

For details check: http://httpd.apache.org/security/vulnerabilities_22.html