[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 kencu):

 yup. hard coded to assume major version is 10 in here <https://github.com
 /gcc-mirror/gcc/blob/master/gcc/config/darwin-c.c> with fallback to oldest
 system. maybe there are other places this is done as well.

 this is totally an upstream issue, it would seem. I did not notice the gcc
 bug report about it yet.

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Ticket URL: <https://trac.macports.org/ticket/60908#comment:1>
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