devel/ocaml-findlib: the port had been updated to version 1.8.1
- This is not the latest version, but this step lubricates coming
next phase of our OCaml stack update
- Since we're post-4.06 now, remove support for Num library which
is a separate port/package
- Detect optionally installed libraries and adjust the packaging
list accordingly
- Spell `Tk' correctly in the TOOLBOX option description
PR: 238904, 262791
devel/ocaml-findlib: transient (minor) update to version 1.7.3
There should be no user-visible changes, but it makes easier to
handle Num library which was split off the core OCaml starting
with 4.06.0 release.