Make some additional UTF8 public

include/ac/string.h

include/ldap_features.h.in

include/ldap_features.nt

include/ldap_pvt_uc.h

include/ldap_schema.h

include/ldap_utf8.h

libraries/liblber/bprint.c

libraries/liblber/decode.c

libraries/liblber/encode.c

libraries/liblber/io.c

libraries/liblber/lber-int.h

libraries/liblber/memory.c

libraries/liblber/nt_err.c

libraries/liblber/options.c

libraries/liblber/sockbuf.c

libraries/libldap/libldap.dsp

libraries/libldap/result.c

libraries/libldap/sasl.c

libraries/libldap/utf-8.c

libraries/liblunicode/liblunicode.dsp