Changes 2.4.38:
Fixed liblmdb nordahead flag
Fixed liblmdb to check cursor index before cursor_del
Fixed liblmdb wasted space on split
Fixed slapd for certs with a NULL issuerDN
Fixed slapd cn=config with empty nested includes
Fixed slapd syncrepl memory leak with delta-sync MMR
Fixed slapd-bdb/hdb to stop processing on dn not found
Fixed slapd-bdb/hdb with indexed ANDed filters
Fixed slapd-mdb to stop processing on dn not found
Fixed slapd-mdb dangling reader
Fixed slapd-mdb matching rule for OlcDbEnvFlags
Fixed slapd-mdb with indexed ANDed filters
Fixed slapd-meta from blocking other threads
Fixed slapo-syncprov assert with findbase
Updated databases/openldap to 2.4.38