[MacPorts] #52477: rtorrent: Update to 0.9.6 w/ patches for macOS 10.12

[MacPorts]

#52477: rtorrent: Update to 0.9.6 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:  sierra, haspatch  |       Port:  rtorrent
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 Updating rtorrent to 0.9.6 and adding patches to build with newer clang on
 macOS Sierra 10.12. New patches are from current FreeBSD ports tree.
 Depends on newer libtorrent in trac ticket 52476

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Ticket URL: <https://trac.macports.org/ticket/52477>
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