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/misc/adafruit-ampy/default.nix

@@ -0,0 +1,26 @@
+{ lib, python3 }:
+
+with python3.pkgs;
+
+buildPythonApplication rec {
+  pname = "adafruit-ampy";
+  version = "1.1.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "f4cba36f564096f2aafd173f7fbabb845365cc3bb3f41c37541edf98b58d3976";
+  };
+
+  nativeBuildInputs = [ setuptools-scm ];
+  propagatedBuildInputs = [ click python-dotenv pyserial ];
+
+  # No tests
+  doCheck = false;
+
+  meta = with lib; {
+    homepage = "https://github.com/pycampers/ampy";
+    license = licenses.mit;
+    description = "Utility to interact with a MicroPython board over a serial connection";
+    maintainers = with maintainers; [ etu ];
+  };
+}