[sr-dev] Revert d0617167f0aebcaf1e12e6c7f77b2231aed9da51 as it breaks 4.2

Hi,

the commit d0617167f0aebcaf1e12e6c7f77b2231aed9da51 broke Postgres on 4.2. It tries to zero variables which are not in 4.2.

From buildlog: km_pg_con.c: In function 'db_postgres_new_connection': km_pg_con.c:68: error: 'keywords' undeclared (first use in this function) km_pg_con.c:68: error: (Each undeclared identifier is reported only once km_pg_con.c:68: error: for each function it appears in.) km_pg_con.c:69: error: 'values' undeclared (first use in this function) km_pg_con.c:70: error: 'to' undeclared (first use in this function) make[1]: *** [km_pg_con.o] Error 1 make: *** [modules] Error 1