[MacPorts] #60062: selfupdate fails with Xcode 10.1 on macOS 10.13 because it uses the 10.14 SDK which doesn't have i386 bits

[MacPorts]

#60062: selfupdate fails with Xcode 10.1 on macOS 10.13 because it uses the 10.14
SDK which doesn't have i386 bits
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  Reporter:  nikgervae  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.5.4
Resolution:             |   Keywords:  highsierra
      Port:             |
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Comment (by nikgervae):

 Safari had been failing repeatedly to even load the Apple developer page,
 but I switch to Firefox and finally managed to download and install the
 package. All is well now. Thanks for the URL to the item I needed to
 install, it saved some bother.

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Ticket URL: <https://trac.macports.org/ticket/60062#comment:12>
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