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/keepkey/default.nix

@@ -0,0 +1,39 @@
+{ lib
+, fetchFromGitHub
+, buildPythonPackage
+, ecdsa
+, hidapi
+, libusb1
+, mnemonic
+, protobuf
+, pytest
+}:
+
+buildPythonPackage rec {
+  pname = "keepkey";
+  version = "7.2.1";
+
+  src = fetchFromGitHub {
+    owner = "keepkey";
+    repo = "python-keepkey";
+    rev = "v${version}";
+    sha256 = "00hqppdj3s9y25x4ad59y8axq94dd4chhw9zixq32sdrd9v8z55a";
+  };
+
+  propagatedBuildInputs = [ ecdsa hidapi libusb1 mnemonic protobuf ];
+
+  checkInputs = [ pytest ];
+
+  # tests requires hardware
+  doCheck = false;
+
+  # Remove impossible dependency constraint
+  postPatch = "sed -i -e 's|hidapi==|hidapi>=|' setup.py";
+
+  meta = with lib; {
+    description = "KeepKey Python client";
+    homepage = "https://github.com/keepkey/python-keepkey";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ np ];
+  };
+}