[MacPorts] #64924: openjdk## ports should be meta ports

[MacPorts]

#64924: openjdk## ports should be meta ports
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  Reporter:  zman0900                      |      Owner:  usersxx
      Type:  enhancement                   |     Status:  assigned
  Priority:  Normal                        |  Milestone:
 Component:  ports                         |    Version:
Resolution:                                |   Keywords:
      Port:  openjdk17 openjdk11 openjdk8  |
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Comment (by breun):

 > As a meta ports, this seemed to allow other ports to just depend on
 "openjdk11" or "openjdk17", while the user could choose which actual
 implementation to install, such as "openjdk17-temurin".

 I don't think the user could actually choose which implementation to use,
 although that would be nice. Before `openjdk11` and `openjdk17` would just
 install a particular OpenJDK distribution (Eclipse Temurin on x86_64, Azul
 Zulu on arm64).

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Ticket URL: <https://trac.macports.org/ticket/64924#comment:2>
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