[MacPorts] #58441: "port upgrade libgcc8" pulls libgcc9 instead (and fails, of course). Also affects gcc8 port

[MacPorts]

#58441: "port upgrade libgcc8" pulls libgcc9 instead (and fails, of course). Also
affects gcc8 port
-------------------------+--------------------
  Reporter:  mouse07410  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libgcc8     |
-------------------------+--------------------

Comment (by dyne2meter):

 Nope, sorry to report bad. It's beyond messed-up for me, now. I can't even
 install libgcc9 now, required or not, on my legacy system (10.11.6). About
 30 of my ports are now broken because libgcc itself has been rendered
 inactive. Yes, this all started a couple of days ago for me, too.

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Ticket URL: <https://trac.macports.org/ticket/58441#comment:2>
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