Move namePrefix="" python packages out of python-packges.nix

It doesn't make sense to build tools/applications with three different
python interpreter versions, so move them out of python modules list.

Also reverts 53ffc6e0ef.

pkgs/development/python-modules/pylint/default.nix

@@ -0,0 +1,23 @@
+{ stdenv, fetchurl, pythonPackages }:
+
+pythonPackages.buildPythonPackage rec {
+  name = "pylint-0.26.0";
+  namePrefix = "";
+
+  src = fetchurl {
+    url = "http://download.logilab.org/pub/pylint/${name}.tar.gz";
+    sha256 = "1mg1ywpj0klklv63s2hwn5xwxi3wfwgnyz9d4pz32hzb53azq835";
+  };
+
+  propagatedBuildInputs = [ pythonPackages.logilab_astng ];
+
+  postInstall = ''
+    mkdir -p $out/share/emacs/site-lisp
+    cp "elisp/"*.el $out/share/emacs/site-lisp/
+  '';
+
+  meta = {
+    homepage = http://www.logilab.org/project/pylint;
+    description = "A bug and style checker for Python";
+  };
+}