[MacPorts] #50671: boost: Update to 1.65.0

[MacPorts]

#50671: boost: Update to 1.65.0
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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 michaelld):

 @mamoll: Thanks!

 Yes, looks like if you do `+python27` (the default), then you get
 `libboost_python-mt.dylib`. I assume if `+python36` then in CMake you have
 to do `find_package(Boost COMPONENTS python3)` ... a small but critical
 change to be noted.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:50>
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