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/xapp/default.nix

@@ -0,0 +1,46 @@
+{ lib
+, fetchFromGitHub
+, buildPythonPackage
+, psutil
+, pygobject3
+, gtk3
+, gobject-introspection
+, xapps
+, polkit
+}:
+
+buildPythonPackage rec {
+  pname = "xapp";
+  version = "2.2.1";
+
+  src = fetchFromGitHub {
+    owner = "linuxmint";
+    repo = "python-xapp";
+    rev = version;
+    hash = "sha256-UC+0nbf+SRQsF5R0LcrPpmNbaoRM14DC82JccSpsKsY=";
+  };
+
+  propagatedBuildInputs = [
+    psutil
+    pygobject3
+    gtk3
+    gobject-introspection
+    xapps
+    polkit
+  ];
+
+  postPatch = ''
+    substituteInPlace "xapp/os.py" --replace "/usr/bin/pkexec" "${polkit}/bin/pkexec"
+  '';
+
+  doCheck = false;
+  pythonImportsCheck = [ "xapp" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/linuxmint/python-xapp";
+    description = "Cross-desktop libraries and common resources for python";
+    license = licenses.lgpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.mkg20001 ];
+  };
+}