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/ocaml/cppo/default.nix

@@ -0,0 +1,67 @@
+{ lib, stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild
+, buildDunePackage
+}:
+
+let
+  pname = "cppo";
+
+  meta = with lib; {
+    description = "The C preprocessor for OCaml";
+    longDescription = ''
+      Cppo is an equivalent of the C preprocessor targeted at the OCaml language and its variants.
+    '';
+    homepage = "https://github.com/ocaml-community/${pname}";
+    maintainers = [ maintainers.vbgl ];
+    license = licenses.bsd3;
+  };
+
+in
+
+if lib.versionAtLeast ocaml.version "4.02" then
+
+buildDunePackage rec {
+  inherit pname;
+  version = "1.6.9";
+
+  useDune2 = true;
+
+  src = fetchFromGitHub {
+    owner = "ocaml-community";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-NdN2QnVRfRq9hEcSAnO2Wha7icDlf2Zg4JQqoEWmErE=";
+  };
+
+  doCheck = true;
+
+  inherit meta;
+}
+
+else
+
+let version = "1.5.0"; in
+
+stdenv.mkDerivation {
+
+  name = "${pname}-${version}";
+
+  src = fetchFromGitHub {
+    owner = "mjambon";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1xqldjz9risndnabvadw41fdbi5sa2hl4fnqls7j9xfbby1izbg8";
+  };
+
+  buildInputs = [ ocaml findlib ocamlbuild ];
+
+  inherit meta;
+
+  createFindlibDestdir = true;
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  preBuild = ''
+    mkdir -p $out/bin
+  '';
+
+}