[MacPorts] #60908: update GCC10 to accept MACOSX_DEPLOYMENT_TARGET to be 11.0

[MacPorts]

#60908: update GCC10 to accept MACOSX_DEPLOYMENT_TARGET to be 11.0
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  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.99
Resolution:            |   Keywords:
      Port:  gcc10     |
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Comment (by kencu):

 Your best bet here is to find &/or open a gcc bug report to track this,
 and work on it there. There will be many other people interested, but they
 won't find this ticket here to work on it with you. Homebrew, Fink, casual
 users, and MacPorters are all involved.

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:6>
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