[MacPorts] #53227: Update mysql57 to version 5.7.17

[MacPorts]

#53227: Update mysql57 to version 5.7.17
--------------------------+-------------------
  Reporter:  josephsacco  |      Owner:
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  mysql
      Port:  mysql57      |
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Changes (by josephsacco):

 * Attachment "Portfile.diff" added.

 Portfile diff

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Ticket URL: <https://trac.macports.org/ticket/53227>
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