Log Message:
libtorrent-rasterbar: Update to 1.2.8

1.2.8 released

	* validate UTF-8 encoding of client version strings from peers
	* don't time out tracker announces as eagerly while resolving hostnames
	* fix NAT-PMP shutdown issue
	* improve hostname lookup by merging identical lookups
	* fix network route enumeration for large routing tables
	* fixed issue where pop_alerts() could return old, invalid alerts
	* fix issue when receiving have-all message before the metadata
	* don't leave lingering part files handles open
	* disallow calling add_piece() during checking
	* fix incorrect filename truncation at multi-byte character
	* always announce listen port 1 when using a proxy