[MacPorts] #53139: gcc7 update

[MacPorts]

#53139: gcc7 update
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 Reporter:  rouson  |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 Please update the gcc7 port.  The current gcc7 port is dated 20161204.
 I'm hoping to access features that hit the GCC trunk more recently.

 Damian

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