[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
 Keywords:  macOSX build target  |       Port:  gcc10
---------------------------------+--------------------
 gcc10 fails to build because it is confused by deployment target to be
 11.0 hence the configuration is incorrect
 it fails to find specific library locations.

 xgcc: warning: couldn't understand version 11.0

 ld: library not found for -lgcc_s.10.4

 in the config: because it cannot deal with 11.0 version it falls back to
 lowest possible OS version 10.4

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