tcp_close -> closesocket
  ioctl -> ioctlsocket
Modify codes to use tcp_close() instead of close() for sockets.
Modify ioctl codes to be compatible with WINSOCK.

the lock is acquired.  Add comments to that effect.  Remove
unnecessary busy loops from slapd/lock.c and slurpd/lock.c.

library, not header.  Eliminate need for <ac/unistd.h> to sometimes
include <fcntl.h> and/or <sys/file.h>.  Change lock API to expect
fd not FILE*.  Allows wider use and eliminates requirement that
lutil_lockf.h depencency on stdio.h.
Implemented lockf, fcntl, and flock locking in lutil/lockf.c.
Additional implementations (including no-op) may be needed.
Update slapd/lock.c and slurpd/lock.c to use new API.

liblutil/lockf.c wont be compiled.

by portable.h with NDEBUG undefined.  This makes assert() is always
available and automatically disables itself when LDAP_DEBUG is undefined.
I've included a basic assert() for pre-STDC compilers.  It relies on
abort() which may not actually be available.  (well replace abort()
with whatever is appropriate if and when we're faced with a pre-STDC
compiler that doesn't have assert()).

to avoid unportable casts of integers to pointers and back.

rewrote sockbuf_buf_init macro not to expand its argument multiple times.

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).

2. Make ldbm_Env a failure-safe entity.

v3 MODDN (MODRDN) operation on the client side.

from what the current code can handle.