[MacPorts] #61284: python39 fails build on ARM64

[MacPorts]

#61284: python39 fails build on ARM64
-----------------------+----------------------
 Reporter:  michaelld  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  python39
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 During configuration:
 {{{
 :info:configure checking size of pthread_key_t... 8
 :info:configure checking whether pthread_key_t is compatible with int...
 no
 :info:configure configure: error: Unexpected output of 'arch' on OSX
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61284>
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