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-rebar-deps.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, rebar3 }:
+
+{ name
+, version
+, sha256
+, src
+, meta ? { }
+}:
+
+with lib;
+
+stdenv.mkDerivation ({
+  pname = "rebar-deps-${name}";
+  inherit version;
+
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+  dontFixup = true;
+
+  prePhases = ''
+    cp ${src} .
+    HOME='.' DEBUG=1 ${rebar3}/bin/rebar3 get-deps
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p "$out/_checkouts"
+    for i in ./_build/default/lib/* ; do
+       echo "$i"
+       cp -R "$i" "$out/_checkouts"
+    done
+    runHook postInstall
+  '';
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  inherit meta;
+})