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/dune.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, ocaml, findlib, dune_1, dune_2, dune_3 }:
+
+{ pname, version, nativeBuildInputs ? [], enableParallelBuilding ? true, ... }@args:
+
+let Dune =
+  let dune-version = args . duneVersion or (if args.useDune2 or true then "2" else "1"); in
+  { "1" = dune_1; "2" = dune_2; "3" = dune_3; }."${dune-version}"
+; in
+
+if (args ? minimumOCamlVersion && lib.versionOlder ocaml.version args.minimumOCamlVersion) ||
+   (args ? minimalOCamlVersion && lib.versionOlder ocaml.version args.minimalOCamlVersion)
+then throw "${pname}-${version} is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation ({
+
+  inherit enableParallelBuilding;
+  dontAddStaticConfigureFlags = true;
+  configurePlatforms = [];
+
+  buildPhase = ''
+    runHook preBuild
+    dune build -p ${pname} ''${enableParallelBuilding:+-j $NIX_BUILD_CORES}
+    runHook postBuild
+  '';
+  checkPhase = ''
+    runHook preCheck
+    dune runtest -p ${pname} ''${enableParallelBuilding:+-j $NIX_BUILD_CORES}
+    runHook postCheck
+  '';
+  installPhase = ''
+    runHook preInstall
+    dune install --prefix $out --libdir $OCAMLFIND_DESTDIR ${pname}
+    runHook postInstall
+  '';
+
+} // (builtins.removeAttrs args [ "minimalOCamlVersion" "duneVersion" ]) // {
+
+  name = "ocaml${ocaml.version}-${pname}-${version}";
+
+  nativeBuildInputs = [ ocaml Dune findlib ] ++ nativeBuildInputs;
+
+  meta = (args.meta or {}) // { platforms = args.meta.platforms or ocaml.meta.platforms; };
+
+})