[MacPorts] #45698: add mysql56 variant for root5

[MacPorts]

#45698: add mysql56 variant for root5
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 Reporter:  jeisch@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.2
 Keywords:               |       Port:  root5
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 root5 works just fine with MySQL 5.6, please add a variant to avoid
 needing multiple MySQL versions.

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Ticket URL: <https://trac.macports.org/ticket/45698>
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