ocamlPackages.bwd: migrate to finalAttrs

pkgs/development/ocaml-modules/bwd/default.nix

@@ -5,7 +5,7 @@
   qcheck-core,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "bwd";
   version = "2.3.0";
 
@@ -15,7 +15,7 @@ buildDunePackage rec {
   src = fetchFromGitHub {
     owner = "RedPRL";
     repo = "ocaml-bwd";
-    rev = version;
+    rev = finalAttrs.version;
     hash = "sha256-rzn0U/D6kPNsH5hBTElc3d1jfKbgKbjA2JHicpaJtu4=";
   };
 
@@ -25,8 +25,8 @@ buildDunePackage rec {
   meta = {
     description = "Backward Lists";
     homepage = "https://github.com/RedPRL/ocaml-bwd";
-    changelog = "https://github.com/RedPRL/ocaml-bwd/blob/${version}/CHANGELOG.markdown";
+    changelog = "https://github.com/RedPRL/ocaml-bwd/blob/${finalAttrs.version}/CHANGELOG.markdown";
     license = lib.licenses.asl20;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})