[MacPorts] #64372: gcc10: Error: configuring for an unreleased macOS version x86_64-apple-darwin21

[MacPorts]

#64372: gcc10: Error: configuring for an unreleased macOS version x86_64-apple-
darwin21
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  Reporter:  jlaminie              |      Owner:  (none)
      Type:  update                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:
Resolution:                        |   Keywords:
      Port:  gcc10, gcc9, libgcc9  |
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Comment (by kencu):

 see:

 https://github.com/iains/gcc-10-branch/issues/4

 Also, this ticket is a duplicate of #63778

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Ticket URL: <https://trac.macports.org/ticket/64372#comment:2>
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