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/fetch-mix-deps.nix

@@ -0,0 +1,60 @@
+{ stdenvNoCC, lib, elixir, hex, rebar, rebar3, cacert, git }@inputs:
+
+{ pname
+, version
+, sha256
+, src
+, mixEnv ? "prod"
+, debug ? false
+, meta ? { }
+, patches ? []
+, elixir ? inputs.elixir
+, hex ? inputs.hex.override { inherit elixir; }
+, ...
+}@attrs:
+
+stdenvNoCC.mkDerivation (attrs // {
+  nativeBuildInputs = [ elixir hex cacert git ];
+
+  MIX_ENV = mixEnv;
+  MIX_DEBUG = if debug then 1 else 0;
+  DEBUG = if debug then 1 else 0; # for rebar3
+  # the api with `mix local.rebar rebar path` makes a copy of the binary
+  MIX_REBAR = "${rebar}/bin/rebar";
+  MIX_REBAR3 = "${rebar3}/bin/rebar3";
+  # there is a persistent download failure with absinthe 1.6.3
+  # those defaults reduce the failure rate
+  HEX_HTTP_CONCURRENCY = 1;
+  HEX_HTTP_TIMEOUT = 120;
+
+  configurePhase = attrs.configurePhase or ''
+    runHook preConfigure
+    export HEX_HOME="$TEMPDIR/.hex";
+    export MIX_HOME="$TEMPDIR/.mix";
+    export MIX_DEPS_PATH="$TEMPDIR/deps";
+
+    # Rebar
+    export REBAR_GLOBAL_CONFIG_DIR="$TMPDIR/rebar3"
+    export REBAR_CACHE_DIR="$TMPDIR/rebar3.cache"
+    runHook postConfigure
+  '';
+
+  inherit patches;
+
+  dontBuild = true;
+
+  installPhase = attrs.installPhase or ''
+    runHook preInstall
+    mix deps.get --only ${mixEnv}
+    find "$TEMPDIR/deps" -path '*/.git/*' -a ! -name HEAD -exec rm -rf {} +
+    cp -r --no-preserve=mode,ownership,timestamps $TEMPDIR/deps $out
+    runHook postInstall
+  '';
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  inherit meta;
+})