n as a service on NT.

o start it as a service (gets around an annoying pause when starting u
p as a non-service).

  liblutil/ntservice.c change registry key path used for non-default
  	service names.
  slapd/Makefile.in change to generate slapd.syms dynamically
  slapd/daemon.c fix to make NT service ignore SIGBREAK
  slapd/main.c fix to allow NT to retrieve listening url from registry
  slapd/nt_svc.c fix for exported symbols
  slapd/result.c change use of strerror to sock_errstr
  slapd/slapd.syms no longer needed

Changes outside of #ifdef include three value filter processing.

HAVE_NT_SERVICE_MANAGER - when threads are disabled, HAVE_NT_SERVICE_MANAGER
is not defined, but the stubs still must remain defined.

Update single debug/release not to use service manager nor event manager.
Likely breaks MINGW32 port.

See README 1.27 log

Replace old Id as needed (back-tcl).
Leave updating of contribWare to contributors (for now).

backout previous nt changes (actually, just don't include nt_svc.c)

	ldap_defaults.h incorporates non-generated ldapconfig.h values.
	ldap_config.h.in is new template for autoconf generated defaults
		(namely directories and paths)
	ldap_config.h.nt, NT template (must be manually copied)
	s/<ldapconfig.h>/<ldap_defaults.h>/
	s/DIRSEP/LDAP_DIRSEP/ & s/DEFAULT_/LDAP_/