[Toybox] hwclock & rtcwake expect /etc/adjtime to exist

[Patrick Oppenlander]

Hi,

A colleague of mine noticed that after a recent toybox update hwclock
now expects /etc/adjtime to be present. Previously it used to assume
UTC if /etc/adjtime is not present which is consistent with
util-linux.

I've attached patches which address this issue in hwclock and rtcwake.

Regards,

Patrick
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