[MacPorts] #58741: get clang 3.4 and 3.9 4.0 5.0"back"

[MacPorts]

#58741: get clang 3.4 and 3.9 4.0 5.0"back"
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  Reporter:  rmottola  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  clang
      Port:  clang     |
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Comment (by kencu):

 We kept 3.4, 3.7, and 5.0 as stepping stones. I hope I thought that
 through fully...I think that’s the minimal amount needed.

 I have kept them all in backup in case we need them, esp 3.9 , but the
 portfiles will start breaking due to dep changes and base changes sooner
 or later.

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Ticket URL: <https://trac.macports.org/ticket/58741#comment:1>
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