Fwd: (ITS#9001) avl in libldap?

If a client has thousands or more requests in flight at the same time, it has to look up the right request every time it receives a response. As the requests are tracked in a doubly-linked list, lookup tends to take O(n) steps whichever direction we take and things generally get out of hand from there on.

The linked branch puts them into a TAvl for quicker lookup, with another commit to let people test as (t)avl code is part of liblutil at the moment.

Is it worth putting parts of liblutil into libldap or maybe letting liblutil be dynamically linked so it can be used from there?

Are there other options on the table?