[MacPorts] #68453: gcc10-bootstrap: update to gcc 10.5

[MacPorts]

#68453: gcc10-bootstrap: update to gcc 10.5
------------------------------+----------------------
  Reporter:  barracuda156     |      Owner:  catap
      Type:  update           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.8.1
Resolution:                   |   Keywords:
      Port:  gcc10-bootstrap  |
------------------------------+----------------------

Comment (by kencu):

 IMHO, there's no good reason for someone to spend the time to try to make
 gcc10-bootstrap build on Sonoma, even if with sufficient efforts such a
 thing might be possible.

 It's a port used for bootstrapping newer gccs on older systems, and
 bootstrapping clang-11-bootstrap.

 It should just be marked as unbuildable on whatever newer systems it
 doesn't currently build on, and move on to spend your time on something
 more fruitful

-- 
Ticket URL: <https://trac.macports.org/ticket/68453#comment:2>
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