[MacPorts] #41157: mail/postfix: add mysql56 variant

[MacPorts]

#41157: mail/postfix: add mysql56 variant
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  Reporter:  pixilla@…    |      Owner:  jmr@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.1
Resolution:               |   Keywords:
      Port:  postfix      |
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Comment (by jmr@…):

 LGTM. (Can we really still not get rid of mysql5 though?)

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Ticket URL: <https://trac.macports.org/ticket/41157#comment:1>
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