Removed compiler warnings

src/interfaces/ecpg/test/compat_informix/test_informix.pgc

src/interfaces/ecpg/test/errors/init.pgc

...rfaces/ecpg/test/expected/compat_informix-test_informix.c

...s/ecpg/test/expected/compat_informix-test_informix.stderr

...s/ecpg/test/expected/compat_informix-test_informix.stdout

src/interfaces/ecpg/test/expected/errors-init.c

src/interfaces/ecpg/test/expected/errors-init.stderr

src/interfaces/ecpg/test/expected/errors-init.stdout

src/interfaces/ecpg/test/pg_regress.sh