update to 2.4.24

update to 2.4.24
changes:
-Added LDIF line wrapping setting
-Added libldap cert x500UniqueIdentifier handling
-Added libldap_r,libldap formal concurrency API
-Added slapadd attribute value checking
-Added slapcat continue mode for problematic DBs
-Added slapd syncrepl suffixmassage support
-Added slapd multiple listener threads
-Added slapd extensible match for ordering rules
-Added slapd-meta paged results control forwarding
-Added slapd-meta subtree-include support
-Added slapd-null back-config support
-Added slapd-sql autocommit support
-Added slapd-sql support for long long keys
-Added slapo-sssvlv multiple sorts per connection
-many bugfixes
-documentation improvements

approved by Geert Hendrickx (the MAINTAINER)