[MacPorts] #67090: boost171 @1.71.0_6: doesn't build against python3.11

[MacPorts]

#67090: boost171 @1.71.0_6: doesn't build against python3.11
--------------------+-----------------------
 Reporter:  kencu   |      Owner:  michaelld
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  boost171
--------------------+-----------------------
 python311 variant was recently added to boost171, but it doesn't build.

 log has many:
 {{{
 :info:build ./boost/python/object/make_instance.hpp:50:31: error:
 expression is not assignable
 :info:build             Py_SIZE(instance) = offsetof(instance_t, storage);
 :info:build             ~~~~~~~~~~~~~~~~~ ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67090>
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