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/make-symlinks/builder.sh

@@ -0,0 +1,9 @@
+source $stdenv/setup
+
+mkdir $out
+for file in $files
+do
+  subdir=`dirname $file`
+  mkdir -p $out/$subdir
+  ln -s $dir/$file $out/$file
+done

pkgs/build-support/make-symlinks/default.nix

@@ -0,0 +1,7 @@
+{name ? "", stdenv, dir, files}:
+
+stdenv.mkDerivation {
+  inherit dir files;
+  name = if name == "" then dir.name else name;
+  builder = ./builder.sh;
+}