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/eth-keys/default.nix

@@ -0,0 +1,56 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, asn1tools
+, coincurve
+, eth-hash
+, eth-typing
+, eth-utils
+, factory_boy
+, hypothesis
+, isPyPy
+, pyasn1
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "eth-keys";
+  version = "0.4.0";
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "ethereum";
+    repo = "eth-keys";
+    rev = "v${version}";
+    sha256 = "sha256-jG/jJPM4t3z6UQIdc8L6y0DxZiGx5pVuGL8XwbIt60o=";
+  };
+
+  propagatedBuildInputs = [
+    eth-typing
+    eth-utils
+  ];
+
+  checkInputs = [
+    asn1tools
+    factory_boy
+    hypothesis
+    pyasn1
+    pytestCheckHook
+  ] ++ passthru.optional-dependencies.coincurve
+  ++ lib.optional (!isPyPy) eth-hash.optional-dependencies.pysha3
+  ++ lib.optional isPyPy eth-hash.optional-dependencies.pycryptodome;
+
+  pythonImportsCheck = [ "eth_keys" ];
+
+  passthru.optional-dependencies = {
+    coincurve = [ coincurve ];
+  };
+
+  meta = with lib; {
+    description = "Common API for Ethereum key operations";
+    homepage = "https://github.com/ethereum/eth-keys";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}