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/build-rebar3.nix

@@ -0,0 +1,88 @@
+{ stdenv, writeText, erlang, rebar3WithPlugins, openssl, libyaml, lib }:
+
+{ name
+, version
+, src
+, setupHook ? null
+, buildInputs ? [ ]
+, beamDeps ? [ ]
+, buildPlugins ? [ ]
+, postPatch ? ""
+, installPhase ? null
+, buildPhase ? null
+, configurePhase ? null
+, meta ? { }
+, enableDebugInfo ? false
+, ...
+}@attrs:
+
+with lib;
+
+let
+  debugInfoFlag = lib.optionalString (enableDebugInfo || erlang.debugInfo) "debug-info";
+
+  rebar3 = rebar3WithPlugins {
+    plugins = buildPlugins;
+  };
+
+  shell = drv: stdenv.mkDerivation {
+    name = "interactive-shell-${drv.name}";
+    buildInputs = [ drv ];
+  };
+
+  customPhases = filterAttrs
+    (_: v: v != null)
+    { inherit setupHook configurePhase buildPhase installPhase; };
+
+  pkg = self: stdenv.mkDerivation (attrs // {
+
+    name = "${name}-${version}";
+    inherit version;
+
+    buildInputs = buildInputs ++ [ erlang rebar3 openssl libyaml ];
+    propagatedBuildInputs = unique beamDeps;
+
+    inherit src;
+
+    # stripping does not have any effect on beam files
+    # it is however needed for dependencies with NIFs
+    # false is the default but we keep this for readability
+    dontStrip = false;
+
+    setupHook = writeText "setupHook.sh" ''
+      addToSearchPath ERL_LIBS "$1/lib/erlang/lib/"
+    '';
+
+    postPatch = ''
+      rm -f rebar rebar3
+    '' + postPatch;
+
+    buildPhase = ''
+      runHook preBuild
+      HOME=. rebar3 bare compile -path ""
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      mkdir -p "$out/lib/erlang/lib/${name}-${version}"
+      for reldir in src ebin priv include; do
+        [ -d "$reldir" ] || continue
+        # $out/lib/erlang/lib is a convention used in nixpkgs for compiled BEAM packages
+        cp -Hrt "$out/lib/erlang/lib/${name}-${version}" "$reldir"
+      done
+      runHook postInstall
+    '';
+
+    meta = {
+      inherit (erlang.meta) platforms;
+    } // meta;
+
+    passthru = {
+      packageName = name;
+      env = shell self;
+      inherit beamDeps;
+    };
+  } // customPhases);
+in
+fix pkg