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/httpsig/default.nix

@@ -0,0 +1,37 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, setuptools-scm
+, pycryptodome
+, requests
+, six
+}:
+
+buildPythonPackage rec {
+  pname = "httpsig";
+  version = "1.3.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1rkc3zwsq53rjsmc47335m4viljiwdbmw3y2zry4z70j8q1dbmki";
+  };
+
+  buildInputs = [
+    setuptools-scm
+  ];
+
+  propagatedBuildInputs = [
+    pycryptodome
+    requests
+    six
+  ];
+
+  pythonImportsCheck = [ "httpsig" ];
+
+  meta = with lib; {
+    description = "Sign HTTP requests with secure signatures";
+    license = licenses.mit;
+    maintainers = with maintainers; [ srhb ];
+    homepage = "https://github.com/ahknight/httpsig";
+  };
+}