lber: ifdef'ed out lber_..set_nonblock() function because it used ioctl's.
If it remains, it needs to be written to support various methods for
setting non-blocking. ioctls should probably be last choice. configure
could detect existance of fcntl(), ioctl(), etc.
bdb2:
added .dsp/.dsw files and did some basic cleanup (still needs work).
BEWARE: the backend will be compiled.
the backend will NOT be invoked, yet.
the backend CANNOT be invoked, yet, because it is NOT yet
integrated into the new initialization/startup environment
of the slapd server.