[MacPorts] #71727: R: use clang-19

[MacPorts]

#71727: R: use clang-19
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  Reporter:  mohd-akram   |      Owner:  i0ntempest
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  R            |
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Comment (by barracuda156):

 I am not gonna test this, but I have no objections.
 Please also switch all systems to gcc14 in the same go.

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Ticket URL: <https://trac.macports.org/ticket/71727#comment:1>
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