buildDunePackage: new support function; use it to refactor some OCaml derivations

pkgs/development/ocaml-modules/doc-ock-html/default.nix

@@ -1,27 +1,22 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, dune, doc-ock, tyxml, xmlm }:
+{ stdenv, fetchFromGitHub, buildDunePackage, doc-ock, tyxml, xmlm }:
 
-stdenv.mkDerivation rec {
-  name = "ocaml${ocaml.version}-doc-ock-html-${version}";
+buildDunePackage rec {
+  pname = "doc-ock-html";
   version = "1.2.1";
 
   src = fetchFromGitHub {
     owner = "ocaml-doc";
-    repo = "doc-ock-html";
+    repo = pname;
     rev = "v${version}";
     sha256 = "1y620h48qrplmcm78g7c78zibpkai4j3icwmnx95zb3r8xq8554y";
   };
 
-  buildInputs = [ ocaml findlib dune ];
-
   propagatedBuildInputs = [ doc-ock tyxml xmlm ];
 
-  inherit (dune) installPhase;
-
   meta = {
     description = "From doc-ock to HTML";
     license = stdenv.lib.licenses.isc;
     maintainers = [ stdenv.lib.maintainers.vbgl ];
-    inherit (ocaml.meta) platforms;
     inherit (src.meta) homepage;
   };
 }