[MacPorts] #52476: libtorrent: Update to 0.13.6 w/ patches for macOS 10.12

[MacPorts]

#52476: libtorrent: Update to 0.13.6 w/ patches for macOS 10.12
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  Reporter:  torstenb@…  |      Owner:  (none)
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  libtorrent  |
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Comment (by kencu):

 attached the little patch I did to install it, but I have not tested out
 all the other systems or fixes listed above.

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Ticket URL: <https://trac.macports.org/ticket/52476#comment:9>
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