[MacPorts] #71049: openjdk21 @21.0.4+7: error: use of undeclared identifier 'NSBundleExecutableArchitectureARM64' on 10.14 and 10.15

[MacPorts]

#71049: openjdk21 @21.0.4+7: error: use of undeclared identifier
'NSBundleExecutableArchitectureARM64' on 10.14 and 10.15
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  Reporter:  sambthompson         |      Owner:  breun
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.10.2
Resolution:                       |   Keywords:  catalina mojave
      Port:  openjdk21 openjdk17  |
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Comment (by sambthompson):

 Thanks for that, Nils; sorry I was going to enquire about whether to
 update `platforms` line at this point since I wasn't sure about other
 blockers for building 10.12.x and/or 10.13.x (e.g. #69213).

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Ticket URL: <https://trac.macports.org/ticket/71049#comment:15>
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