[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 mamoll):

 I had to update the patch file patch-libs-mpi-build-Jamfile.v2.diff to get
 boost 1.65 to compile with the +openmpi and +python36 variants enabled. I
 have attached the build log and updated port file directory. I'm still
 testing other boost-depedendent ports, but I have already discovered one
 problem for cmake-based ports. This no longer works:
 {{{
 find_package(Boost COMPONENTS python)
 }}}
 because there is no more `libboost_python-mt.dylib`. There is only
 `libboost_python3-mt.dylib`. With the old port, both libraries existed.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:49>
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