[Dovecot] Very minor feature request

Hello,

I'd suggest a way to get to know the "capabilities" of a compiled Dovecot.

The background is that I've run the sequence

./configure --with-ldap && make && make install

twice, all three commands tell me that all is fine (ldap is listed in the modules), but still dovecot told me that ldap is no Usedb module.

A "make clean" before solved the problem -- well, something one should anyway.

Besides, the "dovecot --capabilities" should also list all the defaults.

Bye,

-- Steffen Kaiser