* call-seq:
 * conn.delete_ext(dn, sctrls, cctrls)  => self
 * Delete the entry with the DN, +dn+. +sctrls+ is an array of server
 * controls, whilst +cctrls+ is an array of client controls.
rb_ldap_conn_delete_ext_s (VALUE self, VALUE dn,
                           VALUE serverctrls, VALUE clientctrls)
  RB_LDAP_DATA *ldapdata;
  char *c_dn;
  LDAPControl **sctrls, **cctrls;

  GET_LDAP_DATA (self, ldapdata);
  c_dn = StringValueCStr (dn);
  sctrls = rb_ldap_get_controls (serverctrls);
  cctrls = rb_ldap_get_controls (clientctrls);

  ldapdata->err = ldap_delete_ext_s (ldapdata->ldap, c_dn, sctrls, cctrls);
  Check_LDAP_Result (ldapdata->err);

  return self;