[MacPorts] #47290: digikam: Add variant for external mysql database; rename variant for internal mysql database; update mysql dependency

[MacPorts]

#47290: digikam: Add variant for external mysql database; rename variant for
internal mysql database; update mysql dependency
-------------------------+--------------------------------
 Reporter:  sk-public@…  |      Owner:  macports-tickets@…
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.3.3
 Keywords:               |       Port:  digikam
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 Support for external mysql databases has been disabled by default since
 digikam 4.4 (or thereabouts).  This patch to the 4.8.0 portfile:[[BR]]

 1) Adds a variant, mysql_external to enable support for external mysql
 databases.  [[BR]]

 2) Renames the current mysql_check variant to mysql_internal, to reflect
 what that option actually does -- enable the internal mysql database.
 [[BR]]

 3) Updates the mysql dependency for the internal mysql database to version
 5.6.

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Ticket URL: <https://trac.macports.org/ticket/47290>
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