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/tools/networking/calendar-cli/default.nix

@@ -0,0 +1,34 @@
+{ lib
+, python3
+, fetchFromGitHub
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "calendar-cli";
+  version = "0.13.0";
+
+  src = fetchFromGitHub {
+    owner = "tobixen";
+    repo = "calendar-cli";
+    rev = "v${version}";
+    hash = "sha256-wGigrBl5PJL+fVfnFnHDJ5zyB+Rq3Fm+q9vMvLuBBys=";
+  };
+
+  propagatedBuildInputs = with python3.pkgs; [
+    icalendar
+    caldav
+    pytz
+    tzlocal
+    six
+  ];
+
+  # tests require networking
+  doCheck = false;
+
+  meta = with lib; {
+    description = "Simple command-line CalDav client";
+    homepage = "https://github.com/tobixen/calendar-cli";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ dotlambda ];
+  };
+}