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/rlp/default.nix

@@ -0,0 +1,42 @@
+{ lib
+, fetchFromGitHub
+, buildPythonPackage
+, eth-utils
+, hypothesis
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "rlp";
+  version = "3.0.0";
+
+  src = fetchFromGitHub {
+    owner = "ethereum";
+    repo = "pyrlp";
+    rev = "v${version}";
+    sha256 = "sha256-GRCq4FU38e08fREg5fweig5Y60jLT2k3Yj1Jk8OA6XY=";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "'setuptools-markdown'" ""
+  '';
+
+  propagatedBuildInputs = [
+    eth-utils
+  ];
+
+  checkInputs = [
+    hypothesis
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "rlp" ];
+
+  meta = with lib; {
+    description = "RLP serialization library";
+    homepage = "https://github.com/ethereum/pyrlp";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}