tests/time.c: use libtests
tests/time.c: use libtests

* tests/time.c: Use SKIP_MAIN_UNDEFINED.
(main): Use perror_msg_and_skip and tail_alloc.

Saruta/strace,Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,cuviper/strace