libtorrent-rasterbar: updated to 1.2.12

libtorrent-1.2.12
fix loading of DHT node ID from previous session on startup
use getrandom(), when available, and fall back to /dev/urandom
fix python binding for "value" in dht put alerts
fix bug in python binding for dht_put_mutable_item
fix uTP issue acking FIN packets
validate HTTPS certificates by default (trackers and web seeds)
load SSL certificates from windows system certificate store, to authenticate trackers
introduce mitigation for Server Side Request Forgery in tracker and web seed URLs
fix error handling for pool allocation failure

(adam)