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/misc/flashfocus/default.nix

@@ -0,0 +1,46 @@
+{ lib, python3, netcat-openbsd }:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "flashfocus";
+  version = "2.2.3";
+
+  src = python3.pkgs.fetchPypi {
+    inherit pname version;
+    sha256 = "0cn44hryvz2wl7xklaslxsb3l2i3f8jkgmml0n9v2ks22j5l4r4h";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "pyyaml>=5.1,<6.0" "pyyaml>=5.1"
+
+    substituteInPlace bin/nc_flash_window \
+      --replace "nc" "${lib.getExe netcat-openbsd}"
+  '';
+
+  nativeBuildInputs = with python3.pkgs; [
+    pytest-runner
+  ];
+
+  propagatedBuildInputs = with python3.pkgs; [
+    i3ipc
+    xcffib
+    click
+    cffi
+    xpybutil
+    marshmallow
+    pyyaml
+  ];
+
+  # Tests require access to a X session
+  doCheck = false;
+
+  pythonImportsCheck = [ "flashfocus" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/fennerm/flashfocus";
+    description = "Simple focus animations for tiling window managers";
+    license = licenses.mit;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ artturin ];
+  };
+}