[MacPorts] #56521: gcc8 @8-20170604_2: update to 8.1

[MacPorts]

#56521: gcc8 @8-20170604_2: update to 8.1
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  Reporter:  iqgrande  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.4
Resolution:            |   Keywords:
      Port:  gcc8      |
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Comment (by cjones051073):

 I haven't touched gcc. That PR is indeed to update cctools to add an Xcode
 variant..

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Ticket URL: <https://trac.macports.org/ticket/56521#comment:21>
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