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/xmlschema/default.nix

@@ -0,0 +1,56 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, elementpath
+, lxml
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "xmlschema";
+  version = "1.11.1";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "sissaschool";
+    repo = "xmlschema";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-ccbVYvQBM4U8wgNXlgi5qYxUZHpajWs/eVXbCFdG5bU=";
+  };
+
+  propagatedBuildInputs = [
+    elementpath
+  ];
+
+  checkInputs = [
+    lxml
+    pytestCheckHook
+  ];
+
+  # Ignore broken fixtures, and tests for files which don't exist.
+  # For darwin, we need to explicity say we can't reach network
+  disabledTests = [
+    "export_remote"
+    "element_tree_import_script"
+  ];
+
+  disabledTestPaths = [
+    "tests/test_schemas.py"
+    "tests/test_memory.py"
+    "tests/test_validation.py"
+  ];
+
+  pythonImportsCheck = [
+    "xmlschema"
+  ];
+
+  meta = with lib; {
+    description = "XML Schema validator and data conversion library for Python";
+    homepage = "https://github.com/sissaschool/xmlschema";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jonringer ];
+  };
+}