[MacPorts] #50671: boost: Update to 1.65.1

[MacPorts]

#50671: boost: Update to 1.65.1
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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 mamoll):

 Replying to [comment:53 michaelld]:
 > I'm not including a post-destroot for linking python3-mt to python-mt,
 since that seems "dangerous" & really for developers only & better fixed
 in CMake or elsewhere. Most developers I know have moved to "python2" and
 "python3", with "python" being understood to being "python2" ... so
 "python3" is really it's own separate concept, in my experience.

 Boost can only be installed with only python variant. Many packages that
 look for libboost-python need to be updated. It'd be a big help if the
 FindBoost.cmake module could be patched to correctly find boost.python3
 when used like so:
 {{{
 find_package(Boost COMPONENTS python)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:54>
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