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-ecc/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, cached-property
+, eth-typing
+, eth-utils
+, mypy-extensions
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "py-ecc";
+  version = "6.0.0";
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "ethereum";
+    repo = "py_ecc";
+    rev = "v${version}";
+    sha256 = "sha256-638otYA3e/Ld4mcM69yrqHQnGoK/Sfl/UA9FWnjgO/U=";
+  };
+
+  propagatedBuildInputs = [
+    cached-property
+    eth-typing
+    eth-utils
+    mypy-extensions
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "py_ecc" ];
+
+  meta = with lib; {
+    description = "ECC pairing and bn_128 and bls12_381 curve operations";
+    homepage = "https://github.com/ethereum/py_ecc";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}