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>

maintainers/scripts/debian-patches.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+# Download patches from debian project
+# Usage $0 debian-patches.txt debian-patches.nix
+# An example input and output files can be found in tools/graphics/plotutils
+
+DEB_URL=https://sources.debian.org/data/main
+declare -a deb_patches
+mapfile -t deb_patches < $1
+
+# First letter
+deb_prefix="${deb_patches[0]:0:1}"
+prefix="${DEB_URL}/${deb_prefix}/${deb_patches[0]}/debian/patches"
+
+if [[ -n "$2" ]]; then
+    exec 1> $2
+fi
+
+cat <<EOF
+# Generated by $(basename $0) from $(basename $1)
+let
+  prefix = "${prefix}";
+in
+[
+EOF
+for ((i=1;i < ${#deb_patches[@]}; ++i)); do
+    url="${prefix}/${deb_patches[$i]}"
+    sha256=$(nix-prefetch-url $url)
+    echo "  {"
+    echo "    url = \"\${prefix}/${deb_patches[$i]}\";"
+    echo "    sha256 = \"$sha256\";"
+    echo "  }"
+done
+echo "]"