[PATCH] debuginfod/debuginfod-client.c: correct string format on 32bit arches with 64bit time_t

[Frank Ch. Eigler]

Hi -

> [...]
> We seem to not expect these intervals to be much bigger than a week,
> so an int should always be big enough (even when stretched up to a
> whole year).

Yes, ints are fine for these humane-number-of-seconds kinds of values
in the cache configuration.  There's no need for maximum length
integers or even longs for purposes of storage/parse.  In the later
interval arithmetic related to time_t values, we can widen them to
(time_t) then and there.

- FChE