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/tools/networking/xxh/default.nix

@@ -0,0 +1,41 @@
+{ lib
+, fetchFromGitHub
+, buildPythonApplication
+, pexpect
+, pyyaml
+, openssh
+, nixosTests
+, pythonOlder
+}:
+
+buildPythonApplication rec{
+  pname = "xxh";
+  version = "0.8.10";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = pname;
+    repo = pname;
+    rev = version;
+    hash = "sha256-2RMzgIAhM//XReCFBGlTlXn9j4WQiM/k2pLxP2iPUy8=";
+  };
+
+  propagatedBuildInputs = [
+    pexpect
+    pyyaml
+    openssh
+  ];
+
+  passthru.tests = {
+    inherit (nixosTests) xxh;
+  };
+
+  meta = with lib; {
+    description = "Bring your favorite shell wherever you go through SSH";
+    homepage = "https://github.com/xxh/xxh";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ pasqui23 ];
+  };
+}