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>
(cherry picked from commit 6dc9f79)
Reason: Without this fix, ip2unix is pretty much useless for more
        substantial services.

pkgs/tools/networking/ip2unix/default.nix

@@ -5,13 +5,13 @@
 
 stdenv.mkDerivation rec {
   name = "ip2unix-${version}";
-  version = "2.0.0";
+  version = "2.0.1";
 
   src = fetchFromGitHub {
     owner = "nixcloud";
     repo = "ip2unix";
     rev = "v${version}";
-    sha256 = "0xxwx1ip5jhkq93b91gcqd1i4njlvl9c4vjzijbdhjrrzz971iwk";
+    sha256 = "1x2nfv15a1hg8vrw5vh8fqady12v9hfrb4p3cfg0ybx52y0xs48a";
   };
 
   nativeBuildInputs = [