[MacPorts] #67338: py-pyobjc @9.0.1 fails to build on <= 10.13

[MacPorts]

#67338: py-pyobjc @9.0.1 fails to build on <= 10.13
--------------------+-----------------------
 Reporter:  jmroot  |      Owner:  danchr
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-pyobjc
--------------------+-----------------------
 Attaching log from
 [https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/190311
 py311-pyobjc on 10.13], in which the error is:
 {{{
 Modules/objc/helpers-vector.m:13660:5: error: unknown type name
 'MPSAxisAlignedBoundingBox'; did you mean 'MDLAxisAlignedBoundingBox'?
     MPSAxisAlignedBoundingBox rv;
     ^~~~~~~~~~~~~~~~~~~~~~~~~
     MDLAxisAlignedBoundingBox
 /System/Library/Frameworks/ModelIO.framework/Headers/MDLTypes.h:95:3:
 note: 'MDLAxisAlignedBoundingBox' declared here
 } MDLAxisAlignedBoundingBox;
   ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67338>
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