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/sacad/default.nix

@@ -0,0 +1,39 @@
+{ lib, python3Packages, jpegoptim, optipng }:
+
+python3Packages.buildPythonApplication rec {
+  pname = "sacad";
+  version = "2.4.0";
+
+  src = python3Packages.fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-KLVkyiXjpqskM67W9uPl9aPKc3pYMu0nAfwI0OpOniE=";
+  };
+
+  propagatedBuildInputs = with python3Packages; [
+    aiohttp
+    appdirs
+    bitarray
+    cssselect
+    fake-useragent
+    lxml
+    mutagen
+    pillow
+    tqdm
+    unidecode
+    web-cache
+    jpegoptim
+    optipng
+  ];
+
+  # tests require internet connection
+  doCheck = false;
+
+  pythonImportsCheck = [ "sacad" ];
+
+  meta = with lib; {
+    description = "Smart Automatic Cover Art Downloader";
+    homepage = "https://github.com/desbma/sacad";
+    license = licenses.mpl20;
+    maintainers = with maintainers; [ fortuneteller2k ];
+  };
+}