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/tools/build-managers/rebar/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchFromGitHub, erlang }:
+
+stdenv.mkDerivation rec {
+  pname = "rebar";
+  version = "2.6.4";
+
+  src = fetchFromGitHub {
+    owner = "rebar";
+    repo = "rebar";
+    rev = version;
+    sha256 = "sha256-okvG7X2uHtZ1p+HUoFOmslrWvYjk0QWBAvAMAW2E40c=";
+  };
+
+  buildInputs = [ erlang ];
+
+  buildPhase = "escript bootstrap";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp rebar $out/bin/rebar
+  '';
+
+  meta = {
+    homepage = "https://github.com/rebar/rebar";
+    description = "Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases";
+
+    longDescription = ''
+      rebar is a self-contained Erlang script, so it's easy to
+      distribute or even embed directly in a project. Where possible,
+      rebar uses standard Erlang/OTP conventions for project
+      structures, thus minimizing the amount of build configuration
+      work. rebar also provides dependency management, enabling
+      application writers to easily re-use common libraries from a
+      variety of locations (git, hg, etc).
+    '';
+
+    platforms = lib.platforms.unix;
+    license = lib.licenses.asl20;
+    maintainers = lib.teams.beam.members;
+  };
+}