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/amazon-ion/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, jsonconversion
+, six
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "amazon-ion";
+  version = "0.9.1";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchPypi {
+    pname = "amazon.ion";
+    inherit version;
+    hash = "sha256-Moq1e7LmI0L7DHg6UNYvseEDbqdL23aCwL38wDm3yCA=";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "'pytest-runner'," ""
+  '';
+
+  propagatedBuildInputs = [
+    jsonconversion
+    six
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "amazon.ion"
+  ];
+
+  meta = with lib; {
+    description = "Python implementation of Amazon Ion";
+    homepage = "https://github.com/amzn/ion-python";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ terlar ];
+  };
+}