DelConstEx

***********************************************
** delete a member of enum - a symbolic constant
        arguments:      enum_id - id of enum
                        value   - value of symbolic constant.
                        serial  - serial number of the constant in the
                                  enumeration. See OpEnumEx() for
                                  for details.
                        bmask   - bitmask of the constant
                                  ordinary enums accept only -1 as a bitmask
        returns:        1-ok,0-failed

success DelConstEx(long enum_id,long value,long serial,long bmask);