[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
-----------------------+---------------------------------
  Reporter:  vdoublie  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.99
Resolution:            |   Keywords:  macOSX build target
      Port:  gcc10     |
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Comment (by vdoublie):

 it shows up once user upgrades to 11.0b3 and xc. 12b3 b2's remain 10.16
 and all is good

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:2>
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