[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 cjones051073):

 The repo above is not required to fix things for macOS 11 running on
 Intel. The patches above work fine on this arch so I think I will commit
 these to at least get gcc10 working on Intel.

 Fixing things for Apple Silicon is an entirely different issue, tbh.

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:14>
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