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/xmodem/default.nix

@@ -0,0 +1,26 @@
+{ lib, buildPythonPackage, fetchFromGitHub, pytest, which, lrzsz }:
+
+buildPythonPackage rec {
+  pname = "xmodem";
+  version = "0.4.6";
+
+  src = fetchFromGitHub {
+    owner = "tehmaze";
+    repo = "xmodem";
+    rev = version;
+    sha256 = "1xx7wd8bnswxa1fv3bfim2gcamii79k7qmwg7dbxbjvrhbcjjc0l";
+  };
+
+  checkInputs = [ pytest which lrzsz ];
+
+  checkPhase = ''
+    pytest
+  '';
+
+  meta = with lib; {
+    description = "Pure python implementation of the XMODEM protocol";
+    maintainers = with maintainers; [ emantor ];
+    homepage = "https://github.com/tehmaze/xmodem";
+    license = licenses.mit;
+  };
+}