Workaround SSL certificate verification bug in wget

qa.debian.org now always uses the https version.
This has triggered an old bug in wget which still exists
in Ubuntu 12.04 [1][2]. This workaround disables SSL
certificate verification until the server is updated
to Ubuntu 14.04.

http://savannah.gnu.org/bugs/?23934
https://bugs.launchpad.net/ubuntu/+source/wget/+bug/733888