Berkeley DB detection problems

[Adrian Buciuman]

> bdb-libdir will determine -L linker option, while bdb-incdir will
> determine -I (uppercase i) option  and indirectly, via version in the
> header, -l (lowercase L) option, the version known internally by cyrus
> and optionally rpath.
>
> Regards,
> Adrian Buciuman
>

Sorry, I've made a mistake. Forget about the rpath. It should't be
determined by bdb-incdir.