[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     |
-------------------------+--------------------
Changes (by mouse07410):

 * Attachment "main.log.zip" added.

 main.log for libgcc9. It does not explain why libgcc8 port suddenly
 decided that it needs libgcc9

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