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/build-support/ocaml/oasis.nix

@@ -0,0 +1,46 @@
+{ lib, stdenv, ocaml_oasis, ocaml, findlib, ocamlbuild }:
+
+{ pname, version, nativeBuildInputs ? [], meta ? { platforms = ocaml.meta.platforms or []; },
+  minimumOCamlVersion ? null,
+  createFindlibDestdir ? true,
+  dontStrip ? true,
+  ...
+}@args:
+
+if args ? minimumOCamlVersion &&
+   lib.versionOlder ocaml.version args.minimumOCamlVersion
+then throw "${pname}-${version} is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation (args // {
+  name = "ocaml${ocaml.version}-${pname}-${version}";
+
+  nativeBuildInputs = [ ocaml findlib ocamlbuild ocaml_oasis ] ++ nativeBuildInputs;
+
+  inherit createFindlibDestdir;
+  inherit dontStrip;
+
+  strictDeps = true;
+
+  buildPhase = ''
+    runHook preBuild
+    oasis setup
+    ocaml setup.ml -configure --prefix $OCAMLFIND_DESTDIR --exec-prefix $out
+    ocaml setup.ml -build
+    runHook postBuild
+  '';
+
+  checkPhase = ''
+    runHook preCheck
+    ocaml setup.ml -test
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out
+    ocaml setup.ml -install
+    runHook postInstall
+  '';
+
+})