pylint: fix 1.9

It depends on pyenchant, which is disabled on python2. This results
in:
```
nix-env -iA unstable.python27Packages.pylint
replacing old 'python2.7-pylint-1.9.5'
installing 'python2.7-pylint-1.9.5'
error: pyenchant-3.1.1 not supported for interpreter python2.7
```

Remove it, à la
https://github.com/NixOS/nixpkgs/commit/eb0d5fc3f076ad8fbac43158e77277066bbe28b9
and now it builds again.

pkgs/development/python-modules/pylint/1.9.nix

@@ -1,6 +1,6 @@
 { stdenv, lib, buildPythonPackage, fetchPypi, astroid, six, isort,
   mccabe, configparser, backports_functools_lru_cache, singledispatch,
-  pytest, pytestrunner, pyenchant, setuptools }:
+  pytest, pytestrunner, setuptools }:
 
 buildPythonPackage rec {
   pname = "pylint";
@@ -11,7 +11,7 @@ buildPythonPackage rec {
     sha256 = "004kfapkqxqy2s85pmddqv0fabxdxywxrlbi549p0v237pr2v94p";
   };
 
-  checkInputs = [ pytest pytestrunner pyenchant ];
+  checkInputs = [ pytest pytestrunner ];
 
   propagatedBuildInputs = [ astroid six isort mccabe configparser backports_functools_lru_cache singledispatch setuptools ];