[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
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  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 jmroot):

 So it's clearly a build-time only dependency. `port echo installed and
 'depends::clang-17(\s|$)'`

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Ticket URL: <https://trac.macports.org/ticket/71823#comment:3>
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