Stable updated to OpenLDAP 1.2.10

["Kurt D. Zeilenga" <Kurt@OpenLDAP.org>]

OpenLDAP 1.2.10 is considered the most stable release
of OpenLDAP available and is now OPENLDAP_STABLE.

Changes included in OpenLDAP 1.2.10
    CVS Tag: OPENLDAP_REL_ENG_1_2_10
    Add slapd -DSLAPD_UNDEFINED_OC_IS_NOT_EXTENSIBLE macro disable
        undefined object classes implies extensible object behavior.
    Add GNU Pth support (ITS#453)
    Fixed -lldap Kerberos bind to work ldap_init() (ITS#426)
    Changed -lldap to ignore space in filter: ( !(foo=bar)) (ITS#459)
    Fixed multiple password support (ITS#464)
    Fixed -lldap chasing of delete referrals (ITS#471)
    Fixed back-ldbm/bind invalid credentials vs no such object bug
    Fixed slapd str2entry uninitialized variable bug (ITS#482)
    Fixed back-ldbm/modify mutlivalued indexing bug
    Fixed -llber seqorset buffer overrun bug (ITS#479)
    Build Environment
        Do not list unsupported LDBM API option NDBM
        Allow DEFAULT_DB_PAGE_SIZE to be defined at build time