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/async-lru/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchFromGitHub
+, pytestCheckHook
+, pytest-asyncio
+}:
+
+buildPythonPackage rec {
+  pname = "async-lru";
+  version = "1.0.3";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "aio-libs";
+    repo = "async-lru";
+    rev = "v${version}";
+    hash = "sha256-98ZPFSOFRnymTCfCG9OuajfxXAWyCrByyJEHhpPVPbM=";
+  };
+
+  postPatch = ''
+    sed -i -e '/^addopts/d' -e '/^filterwarnings/,+2d' setup.cfg
+  '';
+
+  checkInputs = [
+    pytestCheckHook
+    pytest-asyncio
+  ];
+
+  pytestFlagsArray = [
+    "--asyncio-mode=strict"
+  ];
+
+  pythonImportsCheck = [ "async_lru" ];
+
+  meta = with lib; {
+    description = "Simple lru cache for asyncio";
+    homepage = "https://github.com/wikibusiness/async_lru";
+    license = licenses.mit;
+    maintainers = with maintainers; [ dotlambda ];
+  };
+}