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/package-management/nix-update/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, buildPythonApplication
+, fetchFromGitHub
+, nix
+, nix-prefetch
+, nixpkgs-fmt
+, nixpkgs-review
+}:
+
+buildPythonApplication rec {
+  pname = "nix-update";
+  version = "0.5.1";
+
+  src = fetchFromGitHub {
+    owner = "Mic92";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-d2S18cBkFJOIGFKrwj9U4bRvdPjrbuWfRUVug1JEw0s=";
+  };
+
+  makeWrapperArgs = [
+    "--prefix" "PATH" ":" (lib.makeBinPath [ nix nix-prefetch nixpkgs-fmt nixpkgs-review ])
+  ];
+
+  checkPhase = ''
+    $out/bin/nix-update --help >/dev/null
+  '';
+
+  meta = with lib; {
+    description = "Swiss-knife for updating nix packages";
+    inherit (src.meta) homepage;
+    license = licenses.mit;
+    maintainers = with maintainers; [ mic92 zowoq ];
+    platforms = platforms.all;
+  };
+}