[MacPorts] #67637: Universal builds with clang erroneously require clang itself to be universal

[MacPorts]

#67637: Universal builds with clang erroneously require clang itself to be
universal
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  Reporter:  fhgwright  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:             |
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Comment (by fhgwright):

 Getting back to the exact state where this happened might be nontrivial,
 but I believe it involved a case where the chosen compiler was either
 uninstalled or outdated at the time, and when it decided to install or
 upgrade it, it specified `+universal`, probably inherited from the
 original upgrade target.  That's not the same as your test case above,
 where the chosen compiler is already active and up to date.

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Ticket URL: <https://trac.macports.org/ticket/67637#comment:2>
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