[MacPorts] #58511: boost: update to 1.7.0

[MacPorts]

#58511: boost: update to 1.7.0
-----------------------+--------------------
 Reporter:  stanimura  |      Owner:  (none)
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.5.4
 Keywords:             |       Port:  boost
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 boost has been updated to 1.7.0 on April 12th, 2019.

 For my case, boost version 1.69 (or newer) is needed to build RStudio.
 {{{
 CMake Error at /opt/local/share/cmake-3.14/Modules/FindBoost.cmake:2155
 (message):
   Unable to find the requested Boost libraries.

   Boost version: 1.66.0

   Boost include path: /opt/local/include

   Detected version of Boost is too old.  Requested version was 1.69 (or
   newer).
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58511>
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