Removed external include/library paths from projects.  External paths should
be set via Tools | Options | Directories.  This allows each developer the
freedom to install external libraries where they desire.
Used libdb.lib instead of libdbs.lib to avoid thread conflicts.
Added hs_regex.lib to library input.  We require some form of regex, this
library works (and is relatively easy for the user to install).
Removed a little lint which MCVC5 detected.
Need to sort out single-threaded vs multithreaded library generation.

  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.