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/aiosignal/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, frozenlist
+, pytest-asyncio
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "aiosignal";
+  version = "1.2.0";
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "aio-libs";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1pamfc2l95s1q86jvmbp17chjy129gk01kwy8xm88d2ijy8s1caq";
+  };
+
+  propagatedBuildInputs = [
+    frozenlist
+  ];
+
+  checkInputs = [
+    pytest-asyncio
+    pytestCheckHook
+  ];
+
+  postPatch = ''
+    substituteInPlace pytest.ini \
+      --replace "filterwarnings = error" "" \
+      --replace "--cov=aiosignal" ""
+  '';
+
+  pythonImportsCheck = [ "aiosignal" ];
+
+  meta = with lib; {
+    description = "Python list of registered asynchronous callbacks";
+    homepage = "https://github.com/aio-libs/aiosignal";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ fab ];
+  };
+}