pythonPackages.turses: disabled pypy and py3k builds

pkgs/top-level/python-packages.nix

···
 
   turses = buildPythonPackage (rec {
     name = "turses-0.3.1";
+    disabled = isPyPy || isPy3k;
 
     src = pkgs.fetchurl {
       url = "http://pypi.python.org/packages/source/t/turses/${name}.tar.gz";