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/attrs/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, callPackage
+, buildPythonPackage
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "attrs";
+  version = "21.4.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-YmuoI0IR25joad92IwoTfExAoS1yRFxF1fW3FvB24v0=";
+  };
+
+  outputs = [
+    "out"
+    "testout"
+  ];
+
+  postInstall = ''
+    # Install tests as the tests output.
+    mkdir $testout
+    cp -R tests $testout/tests
+  '';
+
+  pythonImportsCheck = [
+    "attr"
+  ];
+
+  # pytest depends on attrs, so we can't do this out-of-the-box.
+  # Instead, we do this as a passthru.tests test.
+  doCheck = false;
+
+  passthru.tests = {
+    pytest = callPackage ./tests.nix { };
+  };
+
+  meta = with lib; {
+    description = "Python attributes without boilerplate";
+    homepage = "https://github.com/hynek/attrs";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ];
+  };
+}