[MacPorts] #53139: gcc7 update

[MacPorts]

#53139: gcc7 update
---------------------+-----------------
  Reporter:  rouson  |      Owner:
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gcc7    |
---------------------+-----------------
Changes (by raimue):

 * port:   => gcc7


Comment:

 The fastest way to get a newer version would be to provide a patch to
 update the Portfile, see [wiki:howto/Upgrade].

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Ticket URL: <https://trac.macports.org/ticket/53139#comment:1>
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