- Instead of USE_OCAML=yes use USES=ocaml
- Instead of USE_OCAML_WASH use USES=ocaml:wash
- Instead of NO_OCAMLTK_BUILDDEPENDS use USES=ocaml:tkbuild
- USES=ocaml:dune remains unchanged
- Prepare to add/convert more keywords
I prefer to do more atomic/incremental changes rather than making bigger changes in one go. So rather than converting the entire `bsd.ocaml.mk` to valid args for the USES framework I have only converted to use the minimal USES framework and plan to do incremental changes and convert the remaining keywords to args.