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/aiocontextvars/default.nix

@@ -0,0 +1,48 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pytest-runner
+, pytest
+, pytest-asyncio
+, contextvars
+, sqlalchemy
+, isPy27
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "aiocontextvars";
+  version = "0.2.2";
+  disabled = isPy27;
+
+  src = fetchFromGitHub {
+    owner = "fantix";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0a2gmrm9csiknc8n3si67sgzffkydplh9d7ga1k87ygk2aj22mmk";
+  };
+
+  buildInputs = [
+    pytest-runner
+  ];
+
+  checkInputs = [
+    pytest
+    pytest-asyncio
+  ];
+
+  propagatedBuildInputs = [
+    sqlalchemy
+  ] ++ lib.optionals (pythonOlder "3.7") [ contextvars ];
+
+  checkPhase = ''
+    pytest
+  '';
+
+  meta = with lib; {
+    description = "Asyncio support for PEP-567 contextvars backport";
+    homepage = "https://github.com/fantix/aiocontextvars";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.costrouc ];
+  };
+}