[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:  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 kencu):

 taking a quick look, if you just removed that sanity test it might just
 work:
 {{{
 if (version_array[MAJOR] != 10)
     goto fail;
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:3>
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