[MacPorts] #70799: R: all compilers blacklisted on macOS 15

[MacPorts]

#70799: R: all compilers blacklisted on macOS 15
-------------------------+---------------------
  Reporter:  i0ntempest  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  sequoia
      Port:  R           |
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Comment (by cjones051073):

 Correct, currently only gcc14 and clang 18 or 19 work on macOS 15. This
 *may* improve in the future, but also quite possibly will remain a
 restriction. So now would indeed be a good time to bump the versions R
 forces.

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Ticket URL: <https://trac.macports.org/ticket/70799#comment:1>
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