* tests/test-getopt-posix.c: New file.
* tests/test-getopt-gnu.c: New file, with code from test-getopt.c.
* tests/test-getopt-main.h: Renamed from tests/test-getopt.c. Remove
stuff moved to test-getopt-gnu.c. Test TEST_GETOPT_GNU instead of
GNULIB_TEST_GETOPT_GNU.
* modules/getopt-posix-tests (Files): Add test-getopt-posix.c,
test-getopt-main.h. Remove test-getopt.c, test-getopt_long.h.
(Makefile.am): Test test-getopt-posix instead of test-getopt.
* modules/getopt-gnu-tests: New file.
* modules/getopt-gnu (configure.ac): Don't define GNULIB_TEST_GETOPT_GNU.
