[MacPorts] #55571: port diagnose complains about XCode 9.2

[MacPorts]

#55571: port diagnose complains about XCode 9.2
----------------------+--------------------
 Reporter:  janstary  |      Owner:
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  base      |    Version:  2.4.99
 Keywords:            |       Port:
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 This is 2.4.99 on MacOS 10.13.2
 Running `port diagnose` complains that

 Error: currently installed version of Xcode, 9.2, is not supported by
 MacPorts.  For your currently installed system, only the following
 versions of Xcode are supported:  9.1 9.0.1 9.0

 At the same time, the Guide says:

 Always make sure to install the latest available version of Xcode for your
 macOS release.

 Does XCode 9.2 need to be explictly mentioned somewhere inside MacPorts as
 "supported"?

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Ticket URL: <https://trac.macports.org/ticket/55571>
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