[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 vdoublie):

 The issues are deep than expected.
 a quick fix in Darwin-c.c and Darwin-driver.c to accept 11.0 help through
 this.
 leads to deep issue :
 see log undefined functions in libcc1plugin.o

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:5>
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