Make net/GeoIP into a proper library depependency for both ports.
Tune up the comment for qbittorrent, but no PORTREVISION bump since GeoIP
was already a dependency.
Bump PORTREVISION for libtorrent, and add some more configure args both
to cement the GeoIP option and also to assert the defaults on other options.
The wacky post-configure kludge stays for now until I can have more time to
unravel the current asio-related auto* tangle that makes it necessary.