[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
---------------------------+-----------------------------
  Reporter:  sambthompson  |      Owner:  breun
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.2
Resolution:                |   Keywords:  catalina mojave
      Port:  openjdk21     |
---------------------------+-----------------------------

Comment (by breun):

 Hi Sam, would you be able and willing to create a pull request for the
 fix?

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Ticket URL: <https://trac.macports.org/ticket/71049#comment:7>
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