[MacPorts] #56254: mysql56: update to 5.6.39

[MacPorts]

#56254: mysql56: update to 5.6.39
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  Reporter:  josephsacco  |      Owner:  (none)
      Type:  update       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  duplicate    |   Keywords:  haspatch
      Port:  mysql56      |
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Comment (by kencu):

 BTW, `git` built on PPC Tiger also generates incorrect hashes unless you
 build it with gcc6 or gcc7. The similarity is interesting, and makes me
 wonder if there's a connection here.

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Ticket URL: <https://trac.macports.org/ticket/56254#comment:3>
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