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/libraries/rure/update.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -p nix jq curl cargo rsync
+#! nix-shell -i bash
+
+set -eu
+
+cd "$(dirname "$0")"
+
+crate=rure
+
+echo "Getting latest version from crates.io API" >&2
+
+curlOpts=(
+  -H "Accept: application/json"
+  -H "User-Agent: $crate update script (https://github.com/nixos/nixpkgs/)"
+)
+
+version="$(curl "${curlOpts[@]}" "https://crates.io/api/v1/crates/$crate" \
+  | jq -r .crate.max_stable_version)"
+
+echo "Prefetching latest tarball from crates.io" >&2
+
+url="https://crates.io/api/v1/crates/$crate/$version/download"
+prefetch="$(nix-prefetch-url --print-path --type sha256 --unpack "$url")"
+
+cat > pin.json <<EOF
+{
+  "pname": "$crate",
+  "version": "$version",
+  "sha256": "$(printf '%s' "$prefetch" | head -n1)"
+}
+EOF
+
+echo "Generating updated Cargo.lock" >&2
+
+tmp="$(mktemp -d)"
+
+cleanup() {
+  echo "Removing $tmp" >&2
+  rm -rf "$tmp"
+}
+
+trap cleanup EXIT
+
+rsync -a --chmod=ugo=rwX "$(printf '%s' "$prefetch" | tail -n1)/" "$tmp"
+
+pushd "$tmp"
+cargo update
+popd
+
+cp "$tmp/Cargo.lock" ./Cargo.lock