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/itemloaders/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pythonOlder
+, w3lib
+, parsel
+, jmespath
+, itemadapter
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "itemloaders";
+  version = "1.0.4";
+  disabled = pythonOlder "3.6";
+
+  # Tests not included in PyPI tarball
+  src = fetchFromGitHub {
+    owner = "scrapy";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0j68xgx2z63sc1nc9clw6744036vfbijdsghvjv6pk674d5lgyam";
+  };
+
+  propagatedBuildInputs = [ w3lib parsel jmespath itemadapter ];
+
+  checkInputs = [ pytestCheckHook ];
+
+  disabledTests = [
+    # Test are failing (AssertionError: Lists differ: ...)
+    "test_nested_css"
+    "test_nested_xpath"
+  ];
+
+  pythonImportsCheck = [ "itemloaders" ];
+
+  meta = with lib; {
+    description = "Base library for scrapy's ItemLoader";
+    homepage = "https://github.com/scrapy/itemloaders";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.marsam ];
+  };
+}