[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):

 They are. This has been fixed in a repo run by the Darwin lead for gcc. It
 is not ready yet for public consumption, but if you're adventuresome, here
 it is, along with a nascent ARM64 port of gcc:

 <https://github.com/iains/gcc-darwin-arm64>

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:11>
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