[MacPorts] #27289: libtorrent, libtorrent-devel fail to build on 10.5 and 10.4

[MacPorts]

#27289: libtorrent, libtorrent-devel fail to build on 10.5 and 10.4
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  Reporter:  gorzarg@…                    |      Owner:  (none)
      Type:  defect                       |     Status:  assigned
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:  1.9.2
Resolution:                               |   Keywords:  leopard tiger
      Port:  libtorrent libtorrent-devel  |
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Comment (by kencu):

 this is the only remaining libtorrent / rtorrent ticket at the moment.
 these ports now build as c++11. I'll see if there is any chance of getting
 them to built on 10.4 / 10.5 with gcc6 or gcc7.

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Ticket URL: <https://trac.macports.org/ticket/27289#comment:19>
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