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/tools/build-managers/gup/default.nix

@@ -0,0 +1,45 @@
+{ stdenv, fetchFromGitHub, nix-update-source, lib, python3
+, which, runtimeShell, pychecker ? null }:
+stdenv.mkDerivation rec {
+  version = "0.8.0";
+  src = fetchFromGitHub {
+    owner = "timbertson";
+    repo = "gup";
+    rev = "version-${version}";
+    sha256 = "1zjd76jyb5zc9w3l368723bjmxjl05s096g8ipwncfks1p9hdgf3";
+  };
+  pname = "gup";
+  nativeBuildInputs = [ python3 which pychecker ];
+  buildInputs = [ python3 ];
+  strictDeps = true;
+  SKIP_PYCHECKER = pychecker == null;
+  buildPhase = "make python";
+  installPhase = ''
+    mkdir $out
+    cp -r python/bin $out/bin
+  '';
+  passthru.updateScript = [
+    runtimeShell
+    "-c"
+    ''
+      set -e
+      echo
+      cd ${toString ./.}
+      ${nix-update-source}/bin/nix-update-source \
+        --prompt version \
+        --replace-attr version \
+        --set owner timbertson \
+        --set repo gup \
+        --set type fetchFromGitHub \
+        --set rev 'version-{version}' \
+        --modify-nix default.nix
+    ''
+  ];
+  meta = {
+    inherit (src.meta) homepage;
+    description = "A better make, inspired by djb's redo";
+    license = lib.licenses.lgpl2Plus;
+    maintainers = [ lib.maintainers.timbertson ];
+    platforms = lib.platforms.all;
+  };
+}