[MacPorts] #59243: clang-9.0 dependency error in macOS 10.15

[MacPorts]

#59243: clang-9.0 dependency error in macOS 10.15
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  Reporter:  jerryzj    |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.1
Resolution:             |   Keywords:
      Port:  clang-9.0  |
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Comment (by kencu):

 that's part 2 of what I said above. You're right, there is no real need
 for it today. However, the Apple engineer who maintains cctools and ld64
 has traditionally made sure they are the very latest versions on all os
 versions, so it's been a good thing overall throughout MacPorts history.

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Ticket URL: <https://trac.macports.org/ticket/59243#comment:5>
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