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-mix.nix

@@ -0,0 +1,94 @@
+{ stdenv, writeText, elixir, erlang, hex, lib }:
+
+{ name
+, version
+, src
+, buildInputs ? [ ]
+, nativeBuildInputs ? [ ]
+, beamDeps ? [ ]
+, propagatedBuildInputs ? [ ]
+, postPatch ? ""
+, compilePorts ? false
+, meta ? { }
+, enableDebugInfo ? false
+, mixEnv ? "prod"
+, ...
+}@attrs:
+
+with lib;
+let
+  shell = drv: stdenv.mkDerivation {
+    name = "interactive-shell-${drv.name}";
+    buildInputs = [ drv ];
+  };
+
+  pkg = self: stdenv.mkDerivation (attrs // {
+    name = "${name}-${version}";
+    inherit version src;
+
+    MIX_ENV = mixEnv;
+    MIX_DEBUG = if enableDebugInfo then 1 else 0;
+    HEX_OFFLINE = 1;
+
+    # add to ERL_LIBS so other modules can find at runtime.
+    # http://erlang.org/doc/man/code.html#code-path
+    # Mix also searches the code path when compiling with the --no-deps-check flag
+    setupHook = attrs.setupHook or
+      writeText "setupHook.sh" ''
+      addToSearchPath ERL_LIBS "$1/lib/erlang/lib"
+    '';
+
+    buildInputs = buildInputs ++ [ ];
+    nativeBuildInputs = nativeBuildInputs ++ [ elixir hex ];
+    propagatedBuildInputs = propagatedBuildInputs ++ beamDeps;
+
+    configurePhase = attrs.configurePhase or ''
+      runHook preConfigure
+
+      ${./mix-configure-hook.sh}
+
+      runHook postConfigure
+    '';
+
+    buildPhase = attrs.buildPhase or ''
+      runHook preBuild
+      export HEX_HOME="$TEMPDIR/hex"
+      export MIX_HOME="$TEMPDIR/mix"
+      mix compile --no-deps-check
+      runHook postBuild
+    '';
+
+    installPhase = attrs.installPhase or ''
+      runHook preInstall
+
+      # This uses the install path convention established by nixpkgs maintainers
+      # for all beam packages. Changing this will break compatibility with other
+      # builder functions like buildRebar3 and buildErlangMk.
+      mkdir -p "$out/lib/erlang/lib/${name}-${version}"
+
+      # Some packages like db_connection will use _build/shared instead of
+      # honoring the $MIX_ENV variable.
+      for reldir in _build/{$MIX_ENV,shared}/lib/${name}/{src,ebin,priv,include} ; do
+        if test -d $reldir ; then
+          # Some builds produce symlinks (eg: phoenix priv dircetory). They must
+          # be followed with -H flag.
+          cp  -Hrt "$out/lib/erlang/lib/${name}-${version}" "$reldir"
+        fi
+      done
+
+      runHook postInstall
+    '';
+
+    # stripping does not have any effect on beam files
+    # it is however needed for dependencies with NIFs like bcrypt for example
+    dontStrip = false;
+
+    passthru = {
+      packageName = name;
+      env = shell self;
+      inherit beamDeps;
+    };
+  });
+in
+fix pkg
+