[MacPorts] #59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK on 10.14

[MacPorts]

#59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK on 10.14
----------------------+--------------------
  Reporter:  gverm    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.1
Resolution:           |   Keywords:
      Port:  libgcc9  |
----------------------+--------------------

Comment (by hemmlj):

 Please add keyword "12.0" to have this ticket reported in the ticket
 report for MacOs 12 Montery. Thanks!

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Ticket URL: <https://trac.macports.org/ticket/59340#comment:6>
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