[MacPorts] #50671: boost: Update to 1.64.0

[MacPorts]

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

 to get the lib to compile for OSX i had to add this patch

 https://github.com/boostorg/mpi/commit/f5bdcc1ebfe954bb64835f2a0efd94471da42207

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:44>
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