Replaced complex tests with small ones.

src/interfaces/ecpg/preproc/preproc.y

src/interfaces/ecpg/test/Makefile

src/interfaces/ecpg/test/complex/Makefile

src/interfaces/ecpg/test/complex/header_test.h

src/interfaces/ecpg/test/complex/test1.pgc

src/interfaces/ecpg/test/complex/test2.pgc

src/interfaces/ecpg/test/complex/test3.pgc

src/interfaces/ecpg/test/errors/Makefile

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

src/interfaces/ecpg/test/expected/complex-test1.c

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

src/interfaces/ecpg/test/expected/complex-test1.stdout

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

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

src/interfaces/ecpg/test/expected/complex-test2.stdout

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

src/interfaces/ecpg/test/expected/complex-test3.stdout

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

src/interfaces/ecpg/test/expected/preproc-comment.stderr

src/interfaces/ecpg/test/expected/preproc-comment.stdout