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/toposort/default.nix

@@ -0,0 +1,27 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "toposort";
+  version = "1.7";
+  format = "pyproject";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-3cIYLEKRKkQFEb1/9dPmocq8Osy8Z0oyWMjEHL+7ISU=";
+  };
+
+  pythonImportsCheck = [
+    "toposort"
+  ];
+
+  meta = with lib; {
+    description = "A topological sort algorithm";
+    homepage = "https://pypi.python.org/pypi/toposort/";
+    maintainers = with maintainers; [ tstrobel ];
+    platforms = platforms.unix;
+    license = licenses.asl20;
+  };
+}