Solves a hideous bug which affects lots of things including nix-env.
The question now is, how to rebuild everything that depends directly or indirectly on curl?
More about the underlying bug and its resolution here:
http://comments.gmane.org/gmane.comp.web.curl.library/33285
Bug looks like this:
curl google.com
curl: (7) Failed to connect to 74.125.224.35: Invalid argument
