Zabbix

....I..... [ZBX-4471] fix warnings when applying 2.0 dbpatches

This also fixes escaping in case of PostgreSQL using E syntax:

http://www.postgresql.org/docs/8.1/static/sql-syntax.html#SQL-SYNTAX-CONSTANTS

as in 2.0 we support PostgreSQL 8.1 and later. This was applied also
for new 2.0 installations.