[MacPorts] #55282: Lack of Xcode 9 update not detected with High Sierra OS.

[MacPorts]

#55282: Lack of Xcode 9 update not detected with High Sierra OS.
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 Reporter:  lederermc                   |      Owner:
     Type:  defect                      |     Status:  new
 Priority:  Normal                      |  Milestone:
Component:  base                        |    Version:  2.4.2
 Keywords:  Xcode HighSierra configure  |       Port:
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 If Xcode version less than 9 is installed then macports should detect this
 and stop with error message. I thought I had performed the Xcode update on
 one of my Macs. ffmpeg fails to configure. I spent a lot of time tracking
 down why.  FYI: Home-brew found this.

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Ticket URL: <https://trac.macports.org/ticket/55282>
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