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/validators/default.nix

@@ -0,0 +1,35 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, isPy27
+, decorator
+, six
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "validators";
+  version = "0.18.2";
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "37cd9a9213278538ad09b5b9f9134266e7c226ab1fede1d500e29e0a8fbb9ea6";
+  };
+
+  propagatedBuildInputs = [
+    decorator
+    six
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  meta = with lib; {
+    description = "Python Data Validation for Humans™";
+    homepage = "https://github.com/kvesteri/validators";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.costrouc ];
+  };
+}