Replaced manually synced preproc.y by the one created by the new script.

src/interfaces/ecpg/preproc/preproc.y

src/interfaces/ecpg/test/expected/compat_informix-rnull.c

...nterfaces/ecpg/test/expected/compat_informix-rnull.stderr

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

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

...faces/ecpg/test/expected/compat_informix-test_informix2.c

.../ecpg/test/expected/compat_informix-test_informix2.stderr

src/interfaces/ecpg/test/expected/connect-test1.c.in

src/interfaces/ecpg/test/expected/connect-test1.stderr

src/interfaces/ecpg/test/expected/connect-test2.c

src/interfaces/ecpg/test/expected/connect-test2.stderr

src/interfaces/ecpg/test/expected/connect-test3.c

src/interfaces/ecpg/test/expected/connect-test3.stderr

src/interfaces/ecpg/test/expected/connect-test5.c

src/interfaces/ecpg/test/expected/connect-test5.stderr

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.stderr

src/interfaces/ecpg/test/expected/pgtypeslib-num_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-num_test.stderr

src/interfaces/ecpg/test/expected/preproc-array_of_struct.c