[MacPorts] #57613: port @ 2.5.4: diagnose command gives error about Xcode 10.1

[MacPorts]

#57613: port @ 2.5.4: diagnose command gives error about Xcode 10.1
-------------------------+--------------------
  Reporter:  hardingliu  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:              |
-------------------------+--------------------
Changes (by jmroot):

 * version:  2.5.99 => 2.5.4
 * component:  base => ports


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Ticket URL: <https://trac.macports.org/ticket/57613#comment:5>
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