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

[MacPorts]

#57613: port @ 2.5.4: diagnose command gives error about installed Xcode version
------------------------+--------------------
 Reporter:  hardingliu  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.5.4
 Keywords:  mojave      |       Port:
------------------------+--------------------
 "port diagnose" command gives: Error: currently installed version of
 Xcode, 10.1, is not supported by MacPorts.  For your currently installed
 system, only the following versions of Xcode are supported:  10.0.

 Xcode version: Version 10.1 (10B61)

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