[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):

 Just FYI, I've submitted

 https://github.com/macports/macports-ports/pull/2253

 Without going into details (mail my privately if you are interested and
 have signed the beta NDA) I needed it to test macOS 10.14.

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Ticket URL: <https://trac.macports.org/ticket/56521#comment:18>
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