[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:
 Keywords:               |       Port:  R
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Ticket URL: <https://trac.macports.org/ticket/71727>
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