[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:
 Keywords:  mysql        |       Port:  mysql57
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 Version 5.7.17 has been released.  Editing the Portfile to change the
 version number and the checksums seems to be all that is required.  A diff
 is attached.

 -Joseph

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