[MacPorts] #65987: libgcc9 fails to upgrade on BigSur 11.7

[MacPorts]

#65987: libgcc9 fails to upgrade on BigSur 11.7
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  Reporter:  bradman1972  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:
      Port:  libgcc9      |
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Comment (by cjones051073):

 Just to add. Most ports that just need the gcc runtime (i.e. because the
 compile fortran) should declare a dependency on `libgcc` and not a
 specific `libgccN`. This is precisely why the stub `libgcc` port exists.

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Ticket URL: <https://trac.macports.org/ticket/65987#comment:5>
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