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/xvfb-run/update.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl gnused nix-prefetch jq common-updater-scripts
+# shellcheck shell=bash
+
+set -e
+
+info=$(nix-prefetch-git --quiet --url "https://github.com/archlinux/svntogit-packages" --rev "refs/heads/packages/xorg-server")
+
+rev=$(jq -r '.rev' <<< "$info")
+sha256=$(nix hash to-sri --type sha256 "$(jq -r '.sha256' <<< "$info")")
+dir=$(jq -r '.path' <<< "$info")
+
+newXvfbsha=$(sha256sum "$dir/trunk/xvfb-run")
+oldXvfbsha=$(sha256sum "$(nix build --quiet ".#xvfb-run.src" --json --no-link | jq -r '.[].outputs.out')/trunk/xvfb-run")
+
+if [[ "$newXvfbsha" != "$oldXvfbsha" ]]; then
+    (
+        cd "$(git rev-parse --show-toplevel)"
+        update-source-version xvfb-run "1+g${rev:0:7}" "$sha256" --rev="$rev"
+    )
+fi