[MacPorts] #66495: ocaml: update to 5.0.0

[MacPorts]

#66495: ocaml: update to 5.0.0
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  Reporter:  mohd-akram  |      Owner:  (none)
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ocaml       |
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Comment (by pmetzger):

 So things aren't really that compatible, in particular, there are going to
 be libraries that break and forget anything camlp 4 or 5 related. I'm also
 not sure that coq works yet. However, we kind of have no choice but to
 upgrade so it should probably happen anyway.

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Ticket URL: <https://trac.macports.org/ticket/66495#comment:2>
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