net/lftp: import from old packages version 4.3.6
net/lftp: update to latest 4.5.5, added maintainer, updated description

Signed-off-by: Federico Di Marco <fededim@gmail.com>
Merge pull request #310 from fededim/master

net/lftp: import from old packages version 4.3.6 & update to latest 4.5.5, added maintainer, updated description