[MacPorts] #47772: digikam: update to 4.10.0, mariadb variant and dependency cleanup

[MacPorts]

#47772: digikam: update to 4.10.0, mariadb variant and dependency cleanup
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 Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  digikam
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 This patch bumps digikam to 4.10.0 (svn still had 4.9.0 though I've seen
 reference to a 4.10.0 portfile on here??).

 New variant: `+mariadb` to build against port:mariadb instead of
 port:mysql5 .

 Dependency cleanup:
 Ports depending on Qt should use the appropriate Qt PortGroup instead of
 depends_lib, and the dependencies on port:qca and port:qjson are indirect
 = redundant dependencies. port:qt4-mac-sqlite3-plugin is set to be re-
 incorporated into the main Qt4-mac port (done in port:qt4-mac-devel), so
 this dependency cleanup has been replaced with a path: style formula.

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Ticket URL: <https://trac.macports.org/ticket/47772>
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