Apply --disable-crypt & -disable-cleartext fixes from devel.

libraries/liblutil/passwd.c

servers/slapd/back-ldbm/bind.c

servers/slapd/back-ldbm/init.c

servers/slapd/backend.c

servers/slapd/init.c

servers/slapd/main.c

servers/slapd/proto-slap.h

servers/slapd/tools/ldbmtest.c

servers/slapd/tools/ldif2id2children.c

servers/slapd/tools/ldif2id2entry.c

servers/slapd/tools/ldif2index.c

servers/slapd/tools/ldif2ldbm.c