[MacPorts] #65887: clang-15 builds for multiple archs even without the universal variant which fails

[MacPorts]

#65887: clang-15 builds for multiple archs even without the universal variant which
fails
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:  elcapitan
      Port:  llvm-15     |
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Comment (by cjones051073):

 Actually... Now I look again we only turn them off on macOS 10.10 and
 older. So lets just see if extending that to 10.11 helps.

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Ticket URL: <https://trac.macports.org/ticket/65887#comment:6>
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