(__chk_fail): Write a short message to stderr.
* debug/tst-chk1.c: Include fcntl.h.
(do_test): Redirect stderr to /dev/null.
* debug/test-strcpy_chk.c: Include fcntl.h.
(test_main): Redirect stderr to /dev/null.
(do_one_test, do_random_tests): Use printf instead of
error.