ocamlPackages.opam-file-format: build using dune

Since <https://github.com/NixOS/nixpkgs/pull/109143> has been merged,
switching opam-file-format doesn't create a cyclical dependency of
opam-file-format -> dune -> opaline -> opam-file-format anymore.

Thus we switch to dune which seems to be supported better by upstream
and doesn't require us to patch the 2.1.2 release.

pkgs/development/ocaml-modules/opam-file-format/default.nix

@@ -1,35 +1,22 @@
-{ stdenv, lib, fetchpatch, fetchFromGitHub, ocaml, findlib }:
+{ lib, buildDunePackage, fetchFromGitHub }:
 
-stdenv.mkDerivation rec {
+buildDunePackage rec {
   version = "2.1.2";
-  name = "ocaml${ocaml.version}-opam-file-format-${version}";
+  pname = "opam-file-format";
+
+  useDune2 = true;
 
   src = fetchFromGitHub {
     owner = "ocaml";
-    repo = "opam-file-format";
+    repo = pname;
     rev = version;
     sha256 = "19xppn2s3yjid8jc1wh8gdf5mgmlpzby2cf2slmnbyrgln3vj6i2";
   };
 
-  buildInputs = [ ocaml findlib ];
-
-  installFlags = [ "LIBDIR=$(OCAMLFIND_DESTDIR)" ];
-
-  patches = [
-    ./optional-static.patch
-    # fix no implementation error for OpamParserTypes
-    # can be removed at next release presumably
-    (fetchpatch {
-      url = "https://github.com/ocaml/opam-file-format/pull/41/commits/2a9a92ec334e0bf2adf8d2b4c1b83f1f9f68df8f.patch";
-      sha256 = "090nl7yciyyidmbjfryw3wyx7srh6flnrr4zgyhv4kvjsvq944y2";
-    })
-  ];
-
   meta = {
     description = "Parser and printer for the opam file syntax";
     license = lib.licenses.lgpl21;
     maintainers = [ lib.maintainers.vbgl ];
     inherit (src.meta) homepage;
-    inherit (ocaml.meta) platforms;
   };
 }

pkgs/development/ocaml-modules/opam-file-format/optional-static.patch

@@ -1,13 +0,0 @@
-diff -u a/Makefile b/Makefile
---- a/Makefile
-+++ b/Makefile
-@@ -1,1 +1,5 @@
--TARGETS = opam-file-format.cma opam-file-format.cmxa opam-file-format.cmxs
-+TARGETS = opam-file-format.cma opam-file-format.cmxa
-+
-+ifeq "$(NATDYNLINK)" "true"
-+TARGETS = $(TARGETS) opam-file-format.cmxs
-+endif
-
-all: $(TARGETS)
-