Log Message:
rtorrent: Update to 0.9.8. Update libtorrent to 0.13.8.

Changes:

The feature-bind branch is still not ready, so here's more bug-fixes and
pull requests merged.

Please consider donating (https://rakshasa.github.io/rtorrent/donate.html)
to help fund the development of this client.

* Close log files when reusing a name. (pyroscope)
* Increased max timeout for tracker requests.
* Set max piece size 512mb.
* Switch to C++11 MRT RNG for random bytes. (lps-rocks)
* Added support for openssl 1.1.
* Fix honoring throttle.min_peers* settings in rtorrent. (chros)
* Improved failed tracker bencode parsing. (chros)
* Added example rtorrent.rc. (g0tmi1k)
* Added a temporary name filter. (Toff)
* Added 'log.close' command.
* Added 'd.tracker_announce.force' command.
* Added 'event.system.startup_done/shutdown' commands/events. (chros)
* Added 'd.custom.if_z' command. (pyroscope)
* Added 'd.multicall.filtered' command. (pyroscope)
* Added 'event.view.hide/show' commands. (pyroscope)