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/pysingleton/default.nix

@@ -0,0 +1,26 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "pysingleton";
+  version = "0.2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "5776e7a4ba0bab26709da604f4e648c5814385fef34010723db3da0d41b0dbcc";
+  };
+
+  pythonImportsCheck = [ "singleton" ];
+
+  # No tests in the Pypi package.
+  doCheck = false;
+
+  meta = with lib; {
+    description = "Provides a decorator to create thread-safe singleton classes";
+    homepage = "https://github.com/timofurrer/pysingleton";
+    license = licenses.mit;
+    maintainers = with maintainers; [ kalbasit ];
+  };
+}