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/python3-saml/default.nix

@@ -0,0 +1,34 @@
+{ lib, fetchFromGitHub, buildPythonPackage, isPy3k,
+isodate, lxml, xmlsec, freezegun }:
+
+buildPythonPackage rec {
+  pname = "python3-saml";
+  version = "1.14.0";
+  disabled = !isPy3k;
+
+  src = fetchFromGitHub {
+    owner = "onelogin";
+    repo = "python3-saml";
+    rev = "v${version}";
+    sha256 = "sha256-TAfVXh1fSKhNn/lsi7elq4wFyKCxCtCYUTrnH3ytBTw=";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "lxml<4.7.1" "lxml<5"
+  '';
+
+  propagatedBuildInputs = [
+    isodate lxml xmlsec
+  ];
+
+  checkInputs = [ freezegun ];
+  pythonImportsCheck = [ "onelogin.saml2" ];
+
+  meta = with lib; {
+    description = "OneLogin's SAML Python Toolkit for Python 3";
+    homepage = "https://github.com/onelogin/python3-saml";
+    license = licenses.mit;
+    maintainers = with maintainers; [ zhaofengli ];
+  };
+}