*: use long long to print time_t

*: use long long to print time_t

Since we can't assume time_t to be long, int, or even long long, this
consistently uses %lld/long long (or %llu/unsigned long long in a few
cases) to print time_t/susecond_t values.  This should fix a bunch of
warnings, on NetBSD in particular.

(Unfortunately, there seems to be no "PRId64" style printing macro for
time_t...)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
(cherry picked from commit ef008d2f8dc8f7160d8a3d24a15f2fad79ef3242)