[MacPorts] #71823: Port installs useless llvm-17 and clang-17 over and over again on macOS High Sierra, version 10.13.6

[MacPorts]

#71823: Port installs useless llvm-17 and clang-17 over and over again on macOS
High Sierra, version 10.13.6
------------------------+------------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.5
Resolution:             |   Keywords:  highsierra
      Port:  llvm-17    |
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Comment (by ballapete):

 {{{
 root 263 /\ port echo installed and 'depends::llvm-19(\s|$)'
 mesa                           @24.3.2_0+llvm
 }}}

 needs `llvm-19` but has `set llvm_ver            17` in its `Portfile`?

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Ticket URL: <https://trac.macports.org/ticket/71823#comment:5>
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