[MacPorts] #61249: Mingw-w64 and subports update to mingw-w64 v8

[MacPorts]

#61249: Mingw-w64 and subports update to mingw-w64 v8
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 Reporter:  Gcenx   |      Owner:  mojca
     Type:  update  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:  Update  |       Port:  mingw-w64
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 Mingw-w64 update was released 2020-09-18

 I was just notified of this release so haven’t personally had chance to
 look into this

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Ticket URL: <https://trac.macports.org/ticket/61249>
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