[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     |
-----------------------+------------------------
Changes (by michaelld):

 * Attachment "boost_1.64.0_0.tar.bz2" added.


--
Ticket URL: <https://trac.macports.org/ticket/50671>
MacPorts <https://www.macports.org/>
Ports system for macOS