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/readchar/default.nix

@@ -0,0 +1,46 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+
+# native
+, flake8
+
+# tests
+, pytestCheckHook
+, pexpect
+}:
+
+buildPythonPackage rec {
+  pname = "readchar";
+  version = "3.0.5";
+  format = "setuptools";
+
+  # Don't use wheels on PyPI
+  src = fetchFromGitHub {
+    owner = "magmax";
+    repo = "python-${pname}";
+    rev = "v${version}";
+    sha256 = "sha256:01bjw3ipdzxq1ijn9354nlya625i26ri7jac1dnlj1d1gdd8m5lx";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "--cov readchar" ""
+  '';
+
+  nativeBuildInputs = [
+    flake8
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+    pexpect
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/magmax/python-readchar";
+    description = "Python library to read characters and key strokes";
+    license = licenses.mit;
+    maintainers = [ maintainers.mmahut ];
+  };
+}