transmission: update to 4.1.1

transmission: update to 4.1.1

Bug-fix release. Fixes 20+ bugs and includes some performance
improvements. All users are encouraged to upgrade.

Highlights (all platforms):
 * Fixed a 4.1.0 bug that failed to report some filesystem errors
   to RPC clients querying free space.
 * Fixed a 4.1.0 bug that kept a torrent's updated queue position
   from being shown.
 * Fixed a 4.1.0 bug that caused torrents' queuing order to
   sometimes be lost between sessions.
 * Hardened .torrent parsing by exiting sooner if 'pieces' has
   an invalid size.
 * Reverted a 4.1.0 RPC change that broke some 3rd party code by
   returning floats rather than integers for speed limit fields.
 * Fixed crash when pausing a torrent and editing its tracker
   list at the same time.
 * Fixed 4.1.0 crash on arm32 by switching crc32 libraries to
   Mark Adler's crcany.
 * Require UTF-8 filenames in .torrent files (per BitTorrent spec).
 * Fixed crash when parsing a .torrent file with a bad 'pieces' key.
 * Fixed potential fd leak when launching scripts on POSIX systems.
 * Changed network traffic algorithm to spread bandwidth more
   evenly amongst peers.

Link: https://github.com/transmission/transmission/releases/tag/4.1.1
Signed-off-by: Daniel Golle <redacted>