[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:  base        |    Version:  2.5.99
Resolution:              |   Keywords:
      Port:              |
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Description changed by mf2k:

Old description:

> "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)

New description:

 "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#comment:3>
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