CVE-2012-3526 fix from 030_ipv6.patch

We had segfaults with the master version from the repository when the nginx forwards requests with IPv6 ips to an IPv4 only apache.

Some reasearch pointed me to http://zecrazytux.net/troubleshooting/apache2-segfault-debugging-tutorial and I tried the debian patch, which fixed the problem.

You can reproduce the original problem with:
```curl -H 'X-Forwarded-For: foobar, 127.0.0.1' -v http://127.0.0.1/```

That should segfault before, but not after the commit. Replace foobar with IPv6-Address, if you like.

Please review and merge.