ip2unix: 2.0.0 -> 2.0.1

Upstream fixes:

  - Unregister socket as soon as we know that no rule matches.

I also removed the encode_rules() function which was an artifact left in
version 2.0.0.

Built and tested on i686-linux and x86_64-linux.

Signed-off-by: aszlig <aszlig@nix.build>