[MacPorts] #57189: libomp will not build under Xcode 10 + Mojave

[MacPorts]

#57189: libomp will not build under Xcode 10 + Mojave
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  Reporter:  pmetzger  |      Owner:  eborisch
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libomp    |
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Changes (by pmetzger):

 * Attachment "main.log" added.

 libomp build log

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Ticket URL: <https://trac.macports.org/ticket/57189>
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