adjkerntz(8) on FreeBSD

The text 9c921faf00d0, as FreeBSD 7.0-RELEASE, FreeBSD 6.3-RELEASE, FreeBSD 6.2-RELEASE, FreeBSD 6.1-RELEASE, FreeBSD 6.0-RELEASE shipped it.

adjust local time CMOS clock to reflect time zone changes and keep current timezone offset for the kernel

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