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/py-air-control-exporter/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, buildPythonPackage
+, click
+, fetchPypi
+, flask
+, isPy27
+, nixosTests
+, prometheus-client
+, py-air-control
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "py-air-control-exporter";
+  version = "0.3.1";
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0cwhcyyjzc6wlj7jp5h7fcj1hl03wzrz1if3sg205kh2hfrzzlqq";
+  };
+
+  propagatedBuildInputs = [
+    click
+    flask
+    prometheus-client
+    py-air-control
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "py_air_control_exporter" ];
+
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) py-air-control; };
+
+  meta = with lib; {
+    description = "Exports Air Quality Metrics to Prometheus";
+    homepage = "https://github.com/urbas/py-air-control-exporter";
+    license = licenses.mit;
+    maintainers = with maintainers; [ urbas ];
+  };
+}