[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
------------------------+--------------------------------
 Reporter:  torstenb@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:              |       Port:  libtorrent
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 Updating libtorrent to 0.13.6 and adding patches to build with newer clang
 on macOS Sierra 10.12.
 New patches are from current FreeBSD ports tree

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