ldap fixes for maildrop

I had to make some changes to maildrop to get it to work with my 
postfix+ldap setup.  The patches can be found at:
http://www.seawood.org/Projects/maildrop/maildrop-1.6.3-courier.patch
http://www.seawood.org/Projects/maildrop/maildrop-1.6.3-nobasedn.patch
.

The first change was to introduce the concept of the mailroot to 
maildrop+ldap in the same fashion that mailroot is used by 
courier_imap+ldap.  If the users' home directory or mail storage 
location is not a fully qualified path, maildrop will prepend mailroot 
to the given relative paths.

The second change was to remove the null check for ldap's basedn.  It 
may not be common place but since we run multiple sites out of our 
repository, we have an empty basedn.

- cls



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