[MacPorts] #61623: Portmidi build fails not finding jni.h

[MacPorts]

#61623: Portmidi build fails not finding jni.h
------------------------+----------------------
 Reporter:  juanalexei  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:  bigsur      |       Port:  portmidi
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 Building portmidi fails as it doesn't find jni.h

 Indeed in /System/Library/Frameworks/JavaVM.framework there are no
 headers.

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Ticket URL: <https://trac.macports.org/ticket/61623>
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