Stable updated to OpenLDAP 1.2.11

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

OpenLDAP 1.2.11, the current release, is considered the most stable
release of OpenLDAP available and is now OPENLDAP_STABLE.
Changes since last update of OPENLDAP_STABLE.

Changes included in OpenLDAP 1.2.11
    CVS Tag: OPENLDAP_REL_ENG_1_2_11
    Fixed /tmp races in ud, ldapsearch, ldbmtest and slurpd
    Fixed error in slurpd's filecheck function
    Fixed slurpd to properly restart in oneshot mode, and to report a
        non-zero number of items to process with only one replica.
    Fixed strdup use in libldap/request.c
    Fixed NULL prefix bug in libldap/ufn.c
    Fixed slapd_shutdown extern reference bug (ITS#527)
    Fixed ACL groups member matching
    Raise MAXDBCACHE to 128 (ITS#512)
    Fixed slapd client_addr crash (ITS#579)
    Fixed back-shell realloc bug (ITS#506)
    Build Environment
        Update res_search detection
        Detect and use getpassphrase() and getpass()
        Unset CDPATH
        Change GNU Pth to enable soft syscalls
        Changed RCPT cmds symbol to avoid link conflict (ITS#526)
        Changed LDBM directory to $localstatedir/openldap-ldbm