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/mongoengine/default.nix

@@ -0,0 +1,54 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pymongo
+, isPy27
+, six
+, blinker
+, nose
+, pillow
+, coverage
+}:
+
+buildPythonPackage rec {
+  pname = "mongoengine";
+  version = "0.24.0";
+  disabled = isPy27;
+
+  src = fetchFromGitHub {
+    owner = "MongoEngine";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-BQSB4SGlejARFreeTfqFMzCWvBc6Vvq9EOMLjhAihdI=";
+  };
+
+  propagatedBuildInputs = [
+    pymongo
+    six
+  ];
+
+  checkInputs = [
+    nose
+    pillow
+    coverage
+    blinker
+  ];
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "coverage==4.2" "coverage" \
+      --replace "pymongo>=3.4,<=4.0" "pymongo"
+  '';
+
+  # tests require mongodb running in background
+  doCheck = false;
+
+  pythonImportsCheck = [ "mongoengine" ];
+
+  meta = with lib; {
+    description = "MongoEngine is a Python Object-Document Mapper for working with MongoDB";
+    homepage = "http://mongoengine.org/";
+    license = licenses.mit;
+    maintainers = [ maintainers.costrouc ];
+  };
+}