[MacPorts] #60894: mysql8: build fails with gcc5

[MacPorts]

#60894: mysql8: build fails with gcc5
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  Reporter:  chrstphrchvz  |      Owner:  herbygillot
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.3
Resolution:                |   Keywords:
      Port:  mysql8        |
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Comment (by kencu):

 gcc5 on 10.15 -- you are an intrepid explorer, sir.

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Ticket URL: <https://trac.macports.org/ticket/60894#comment:1>
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