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/depotdownloader/fetch-deps.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p nuget-to-nix dotnet-sdk_5
+set -eo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+deps_file="$(realpath "./deps.nix")"
+
+cd ../../../..
+store_src="$(nix-build . -A depotdownloader.src --no-out-link)"
+src="$(mktemp -d /tmp/depotdownloader-src.XXX)"
+cp -rT "$store_src" "$src"
+chmod -R +w "$src"
+
+pushd "$src"
+
+mkdir ./nuget_tmp.packages
+dotnet restore DepotDownloader.sln --packages ./nuget_tmp.packages
+
+nuget-to-nix ./nuget_tmp.packages > "$deps_file"
+
+popd
+rm -r "$src"