[MacPorts] #64072: libjpeg-turbo: migrate java variant to subport

[MacPorts]

#64072: libjpeg-turbo: migrate java variant to subport
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:  java     |       Port:  libjpeg-turbo
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 Presently Java support is enabled via a variant, which is problematic for
 dependents that require it to be enabled.

 Resolve this by migrating Java support to a subport, if possible.

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Ticket URL: <https://trac.macports.org/ticket/64072>
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