[MacPorts] #50671: boost: Update to 1.64.0

[MacPorts]

#50671: boost: Update to 1.64.0
-----------------------+------------------------
  Reporter:  eborisch  |      Owner:  ryandesign
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:  haspatch
      Port:  boost     |
-----------------------+------------------------

Comment (by michaelld):

 Minor / easy fix required to <boost/serialization/array.hpp>: add in
 {{{
 #include <boost/serialization/array_wrapper.hpp>
 }}}
 after
 {{{
 #include <array>
 }}}

 After that, my ports that use Boost are building thus far (at least with
 respect to boost issues). source-highlight and assimp built without this
 change.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:33>
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