[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
Resolution:               |   Keywords:  haspatch
      Port:  digikam      |
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Comment (by ryandesign@…):

 The obsolete mysql5 port provides mysql_config5.

 Ports should not depend on things created by `port select`. That results
 in non-reproducible builds.

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Ticket URL: <https://trac.macports.org/ticket/47290#comment:5>
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