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/beam-modules/mix-configure-hook.sh

@@ -0,0 +1,18 @@
+# shellcheck shell=bash
+# this hook will symlink all dependencies found in ERL_LIBS
+# since Elixir 1.12.2 elixir does not look into ERL_LIBS for
+# elixir depencencies anymore, so those have to be symlinked to the _build directory
+mkdir -p _build/"$MIX_ENV"/lib
+while read -r -d ':' lib; do
+    for dir in "$lib"/*; do
+    # Strip version number for directory name if it exists, so naming of
+    # all libs matches what mix's expectation.
+    dest=$(basename "$dir" | cut -d '-' -f1)
+    build_dir="_build/$MIX_ENV/lib/$dest"
+    ((MIX_DEBUG == 1)) && echo "Linking $dir to $build_dir"
+    # Symlink libs to _build so that mix can find them when compiling.
+    # This is what allows mix to compile the package without searching
+    # for dependencies over the network.
+    ln -s "$dir" "$build_dir"
+    done
+done <<< "$ERL_LIBS:"