[MacPorts] #56326: rev-upgrade considers gcc as broken due to libstdc++

[MacPorts]

#56326: rev-upgrade considers gcc as broken due to libstdc++
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  Reporter:  raimue  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.4.99
Resolution:          |   Keywords:
      Port:          |
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Comment (by raimue):

 I am fine if this would be fixed once we release MacPorts 2.5.0. We just
 have to remember to rev-bump the gcc ports then.

 To ease the transition, maybe we could have a port-upgrade script that
 sets `cxx_stdlib` and `cxx_stdlib_overridden` for well-known ports?

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Ticket URL: <https://trac.macports.org/ticket/56326#comment:4>
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