[MacPorts] #65280: libgcc10 fails to build on 10.6

[MacPorts]

#65280: libgcc10 fails to build on 10.6
---------------------+----------------------
  Reporter:  jmroot  |      Owner:  mascguy
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.7.2
Resolution:          |   Keywords:
      Port:  gcc10   |
---------------------+----------------------
Changes (by mascguy):

 * owner:  (none) => mascguy
 * cc: cjones051073, kencu (added)
 * version:   => 2.7.2
 * status:  new => assigned


Comment:

 Assuming this is relatively straightforward vis-a-vis `gcc11`, I'll take
 this.

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Ticket URL: <https://trac.macports.org/ticket/65280#comment:1>
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