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/karton-classifier/default.nix

@@ -0,0 +1,48 @@
+{ lib
+, buildPythonPackage
+, chardet
+, fetchFromGitHub
+, karton-core
+, pytestCheckHook
+, python-magic
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "karton-classifier";
+  version = "1.2.0";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "CERT-Polska";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-AG2CtNMgXYfbdlOqB1ZdjMT8H67fsSMXTgiFg6K41IQ=";
+  };
+
+  propagatedBuildInputs = [
+    chardet
+    karton-core
+    python-magic
+  ];
+
+  postPatch = ''
+    substituteInPlace requirements.txt \
+      --replace "chardet==3.0.4" "chardet" \
+      --replace "python-magic==0.4.18" "python-magic"
+  '';
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "karton.classifier" ];
+
+  meta = with lib; {
+    description = "File type classifier for the Karton framework";
+    homepage = "https://github.com/CERT-Polska/karton-classifier";
+    license = with licenses; [ bsd3 ];
+    maintainers = with maintainers; [ fab ];
+  };
+}