add_entry

add entry point
     ordinal  - entry point number
                if entry point doesn't have an ordinal
                number, 'ordinal' should be equal to 'ea'
     ea       - address of the entry point
     name     - name of the entry point. If null string,
                the entry point won't be renamed.
     makecode - if 1 then this entry point is a start
                of a function. Otherwise it denotes data bytes.
returns: 0 - entry point with the specified ordinal already exists
         1 - ok

success add_entry(long ordinal, long ea, string name, long makecode);