[MacPorts] #62232: octave-chrono: remove openjdk12 dependency

[MacPorts]

#62232: octave-chrono: remove openjdk12 dependency
--------------------------+---------------------------
 Reporter:  chrstphrchvz  |      Owner:  Schamschula
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  octave-chrono
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 The `octave-chrono` port was recently added ([6a42a9eacb/macports-ports])
 containing a dependency on `openjdk12`. Public updates for OpenJDK 12
 already ended 2019-09. Can the `octave-chrono` port use a supported Java
 version instead, preferably an LTS Java version e.g. `openjdk11`?

 Also, was there a reason to not use the java portgroup? It's very unusual
 to directly depend on a specific openjdk port.

 (I do not personally use this port. I would like to propose removing ports
 for unsupported Java versions.)

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Ticket URL: <https://trac.macports.org/ticket/62232>
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