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/sentinels/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchPypi
+, setuptools
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "sentinels";
+  version = "1.0.0";
+
+  disabled = pythonOlder "3.5";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1cglkxph47pki4db4kjx5g4ikxp2milqdlcjgqwmx4p1gx6p1q3v";
+  };
+
+  propagatedBuildInputs = [
+    setuptools
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "sentinels" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/vmalloc/sentinels/";
+    description = "Various objects to denote special meanings in python";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ gador ];
+  };
+}