torchat: mark as broken

Looks abandoned by upstream (last commit 2014, no response on
issue tracker).  For an application of this nature it seems
prudent to simply mark the package as broken instead of
attempting to fix the build.

Prospective users can check out richochet or tor messenger.

pkgs/applications/networking/instant-messengers/torchat/default.nix

@@ -33,5 +33,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl3;
     maintainers = [ maintainers.phreedom ];
     platforms = platforms.unix;
+    broken = true;
   };
 }