[MacPorts] #70144: Incorrect conditions for making decisions based on Xcode or Xcode command line tools version

[MacPorts]

#70144: Incorrect conditions for making decisions based on Xcode or Xcode command
line tools version
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 I don't think removing the code is a good idea. Our GitHub Actions CI
 runners have not, for example, been updated to fixed Xcode versions, and
 while we could and should update them, there is no guarantee that users
 have updated. We do not want to expend more time re-investigating this
 problem with such users. polyml, for example, is
 [https://github.com/macports/macports-ports/pull/23934 a port that failed
 to build] and would be fixed by applying this workaround, but I did not do
 so yet since the then-known workaround was wrong, and I filed this ticket
 to discover the correct workaround that can then be applied to polyml and
 all other affected ports or placed into a common portgroup.

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Ticket URL: <https://trac.macports.org/ticket/70144#comment:6>
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