uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

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

@@ -0,0 +1,49 @@
+{ lib
+, fetchPypi
+, buildPythonPackage
+, pythonOlder
+, click
+, joblib
+, regex
+, tqdm
+}:
+
+buildPythonPackage rec {
+  pname = "nltk";
+  version = "3.7";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchPypi {
+    inherit pname version;
+    extension = "zip";
+    hash = "sha256-1lB9ZGDOx21wr+pCQqImp1QvhcZpF3ucf1YrfPGwVQI=";
+  };
+
+  propagatedBuildInputs = [
+    click
+    joblib
+    regex
+    tqdm
+  ];
+
+  # Tests require some data, the downloading of which is impure. It would
+  # probably make sense to make the data another derivation, but then feeding
+  # that into the tests (given that we need nltk itself to download the data,
+  # unless there's an easy way to download it without nltk's downloader) might
+  # be complicated. For now let's just disable the tests and hope for the
+  # best.
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "nltk"
+  ];
+
+  meta = with lib; {
+    description = "Natural Language Processing ToolKit";
+    homepage = "http://nltk.org/";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lheckemann ];
+  };
+}