utmp 64 bit time_t support

[Andreas Schwab]

On Aug 04 2023, Paul Eggert wrote:

> Obviously this Gnulib hack won't work after the year 2038,

It could just re-interpret the timestamp field as an unsigned number.
The utmp databases most likely only contain data for a few years at
most, and timestamps from before the epoch are certainly non-existing.

-- 
Andreas Schwab, schwab@linux-m68k.org
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