Add weighttp 0.3

pkgs/tools/networking/weighttp/default.nix

···
+{ stdenv, fetchurl, python, libev}:
+stdenv.mkDerivation {
+  name = "weighttp-0.3";
+  src = fetchurl {
+    url = http://cgit.lighttpd.net/weighttp.git/snapshot/weighttp-0.3.tar.gz;
+    sha256 = "0gl83vnip3nj7fdgbwqkmrx7kxp51sri9jfiwd04q9iz8f9bsmz5";
+  };
+
+  buildInputs = [ python libev ];
+  installPhase = ''
+    python waf configure --prefix=$out
+    python waf build
+    python waf install
+  '';
+}

pkgs/top-level/all-packages.nix

···
       libxml2 geoip;
   };
 
+  weighttp = callPackage ../tools/networking/weighttp { };
+
   wget = callPackage ../tools/networking/wget {
     inherit (perlPackages) LWP;
   };