[MacPorts] #56294: boost: update to 1.70.0

[MacPorts]

#56294: boost: update to 1.70.0
------------------------+---------------------------------
  Reporter:  michaelld  |      Owner:  ryandesign
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch maintainer
      Port:  boost      |
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Comment (by michaelld):

 OK so i've figured out how to revert library names back to before the
 added <ARCH> ... building using this patch does indeed result in the
 correct ABI naming as we currently have with 1.66.0 ... yay! One issue
 down. Here's the whole patch in case anyone wants to use it right now for
 testing (-p0)
 {{{
 --- boostcpp.jam.orig
 +++ boostcpp.jam
 @@ -163,7 +163,7 @@
              <base> <threading> <runtime> ;
      case 1.69 :
          .format-name-args =
 -            <base> <threading> <runtime> <arch-and-model> ;
 +            <base> <threading> <runtime> ;
      }
  }
  else if $(layout) = system
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56294#comment:21>
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