Fix time syscall decoding for some personalities

* time.c (current_time_t_is_int32): Define.
(sys_time): Use it, printnum_int, and printnum_int64 instead
of printnum_long.
* tests/time.c: New file.
* tests/time.test: New test.
* tests/Makefile.am (check_PROGRAMS): Add time.
(TESTS): Add time.test.
* tests/.gitignore: Add time.
5 files changed