ecpglib major version changed

The ecpglib major version (SO_MAJOR_VERSION) was changed in
bd7c95f0c1a38becffceb3ea7234d57167f6d4bf (Add DECLARE STATEMENT support
to ECPG.), but I don't see anything in that patch that would warrant
that.  I think we should undo that change.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services