[MacPorts] #69568: boost176 @1.76.0_10 : won't build on Xcode 15

[MacPorts]

#69568: boost176 @1.76.0_10 : won't build on Xcode 15
--------------------+----------------------
 Reporter:  rbeyer  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.9.1
 Keywords:          |       Port:  boost176
--------------------+----------------------
 This build error is very likely the result of changes in Xcode 15 (but it
 may be something else):
 {{{
 :info:build ./boost/mpl/aux_/integral_wrapper.hpp:74:31: error: integer
 value -1 is outside the valid range of values [0, 3] for this enumeration
 type [-Wenum-constexpr-conversion]
 }}}

 Apologies for not having the skill or knowledge for how to properly fix
 this, and only being able to flag it.

-- 
Ticket URL: <https://trac.macports.org/ticket/69568>
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