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/compilers/microscheme/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchFromGitHub, makeWrapper, unixtools }:
+
+stdenv.mkDerivation rec {
+  pname = "microscheme";
+  version = "0.9.3";
+
+  src = fetchFromGitHub {
+    owner = "ryansuchocki";
+    repo = "microscheme";
+    rev = "v${version}";
+    sha256 = "5qTWsBCfj5DCZ3f9W1bdo6WAc1DZqVxg8D7pwC95duQ=";
+  };
+
+  postPatch = ''
+    substituteInPlace makefile --replace gcc ${stdenv.cc.targetPrefix}cc
+  '';
+
+  nativeBuildInputs = [ makeWrapper unixtools.xxd ];
+
+  makeFlags = [ "PREFIX=${placeholder "out"}" ];
+
+  meta = with lib; {
+    homepage = "https://ryansuchocki.github.io/microscheme/";
+    description = "A Scheme subset for Atmel microcontrollers";
+    longDescription = ''
+      Microscheme is a Scheme subset/variant designed for Atmel
+      microcontrollers, especially as found on Arduino boards.
+    '';
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ ardumont ];
+  };
+}