[MacPorts] #60193: opencv should not be dependent on Java12

[MacPorts]

#60193: opencv should not be dependent on Java12
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 Reporter:  WolfgangFahl  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:
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 The dependency makes opencv unusable in Java 8 environments. Alternatively
 provide a special port for Java8.

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Ticket URL: <https://trac.macports.org/ticket/60193>
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