Drop the LDAP stuff that was never even close to finished.
There was actually a branch where LDAP support was more or less in a usable
state, but there were still some unsolved problems including the fact that
every setting has its own LDAP schema entry, which would mean lots of
maintenance overhead for pretty much every BitlBee release. :-(
Instead, we'll just stick to the XML format everywhere and just store it
in different ways.
