Log Message:
libtorrent-rasterbar: Update to 1.2.3

Changes:

    fix erroneous event=completed tracker announce when checking files
    promote errors in parsing listen_interfaces to post listen_failed_alert
    fix bug in protocol encryption/obfuscation
    fix buffer overflow in SOCKS5 UDP logic
    fix issue of rapid calls to file_priority() clobbering each other
    clear tracker errors on success
    optimize setting with unlimited unchoke slots
    fixed restoring of trackers, comment, creation date and created-by in resume data
    fix handling of torrents with too large pieces
    fixed division by zero in anti-leech choker
    fixed bug in torrent_info::swap