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/build-support/substitute-files/substitute-all-files.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv }:
+
+args:
+
+stdenv.mkDerivation ({
+  name = if args ? name then args.name else baseNameOf (toString args.src);
+  builder = builtins.toFile "builder.sh" ''
+    source $stdenv/setup
+    set -o pipefail
+
+    eval "$preInstall"
+
+    args=
+
+    pushd "$src"
+    echo -ne "${lib.concatStringsSep "\\0" args.files}" | xargs -0 -n1 -I {} -- find {} -type f -print0 | while read -d "" line; do
+      mkdir -p "$out/$(dirname "$line")"
+      substituteAll "$line" "$out/$line"
+    done
+    popd
+
+    eval "$postInstall"
+  '';
+  preferLocalBuild = true;
+  allowSubstitutes = false;
+} // args)