test-fstatat: new test, to expose Solaris 9 bugs

test-fstatat: new test, to expose Solaris 9 bugs

Share the stat and lstat tests with fstatat.

* tests/test-stat.c (main): Factor guts...
* tests/test-stat.h (test_stat_func): ...into new file.
* tests/test-lstat.c (main): Factor guts...
* tests/test-lstat.h (test_lstat_func): ...into new file.
* tests/test-fstatat.c: New file.
* modules/stat-tests (Files): Add test-stat.h.
* modules/lstat-tests (Files): Add test-lstat.h.
(Depends-on): Add stdbool.
* modules/openat-tests (Depends-on): Add pathmax.
(Files): Add test-lstat.h, test-stat.h, test-fstatat.c.
(Makefile.am): Run new test.

Signed-off-by: Eric Blake <ebb9@byu.net>