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/riprova/default.nix

@@ -0,0 +1,29 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, six
+}:
+
+buildPythonPackage rec{
+  pname = "riprova";
+  version = "0.2.7";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "04drdvjjbh370csv2vb5zamg2aanxqkfm6w361qkybnra4g4g0dz";
+  };
+
+  propagatedBuildInputs = [ six ];
+
+  # PyPI archive doesn't have tests
+  doCheck = false;
+
+  pythonImportsCheck = [ "riprova" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/h2non/riprova";
+    description = "Small and versatile library to retry failed operations using different backoff strategies";
+    license = licenses.mit;
+    maintainers = with maintainers; [ mmilata ];
+  };
+}