fs: fix utime/futime timestamp rounding errors

`uv_fs_utime()` and `uv_fs_futime()` receive the timestamp as
a `double` and then convert it to `struct timeval` or `struct timespec`
where necessary but the calculation for the sub-second part exhibited
rounding errors for dates in the deep past or the far-flung future,
causing the timestamps to be off by sometimes over half a second on
unix, or to be reinterpreted as unsigned and end up off by more than
just sign but many also decades.

Fixes: https://github.com/nodejs/node/issues/32369 (partially)
PR-URL: https://github.com/libuv/libuv/pull/2747
Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

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