[MacPorts] #64579: py310-pyobjc @7.3_2 fails to build on MacOS 10.15

[MacPorts]

#64579: py310-pyobjc @7.3_2 fails to build on MacOS 10.15
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 Reporter:  Gandoon  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  py310-pyobjc
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 While attempting to upgrade py-spyder from py39-spyder to py310-spyder,
 the dependency py310-pyobjc fails to build on MacOS 10.15.
 The failure seems to happen while building pyobjc-framework-Cocoa. This
 makes me suspect that the failure has to do with incompatibilities between
 newer SDKs and the ones available on the now legacy MacOS 10.15.
 As py39-pyobjc builds just fine, and the build is reported as working on
 10.15, I am at an impasse here.
 I have spent some time trying to find a workaround (a fortnight by now),
 but at this moment, I have yet to find one.
 Log attached.

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Ticket URL: <https://trac.macports.org/ticket/64579>
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