Update copyright notice for Ludd (remove clause 3 & 4).

PR/49207: Kamil Rytarowski: Add sys/clock.h with generic time macros
(derived from clock_subr.h). Keep clock_subr.h with the kernel structures
and functions to reduce diffs, and have clock.h only inc

PR/49207: Kamil Rytarowski: Add sys/clock.h with generic time macros
(derived from clock_subr.h). Keep clock_subr.h with the kernel structures
and functions to reduce diffs, and have clock.h only include standalone
constants and macros.

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Correct definition of leap year. Make yeartonum and numtoyear use
full years so that year 2000 is correctly counted as a leap year.

Now NetBSD under SIMH picks up correct time-of-day clock value.

Correct definition of leap year. Make yeartonum and numtoyear use
full years so that year 2000 is correctly counted as a leap year.

Now NetBSD under SIMH picks up correct time-of-day clock value. It
used to be a day behind, since 2000 - 1900 = 100 and naive leap year
test wouldn't count it as a leap year.

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Remove `volatile' qualifier from argument types of
struct timeval passed to todr_gettime(9) and todr_settime(9).
We no longer have an ancient and volatile struct timeval `time'
global since we have s

Remove `volatile' qualifier from argument types of
struct timeval passed to todr_gettime(9) and todr_settime(9).
We no longer have an ancient and volatile struct timeval `time'
global since we have switched to MI timercounter(9) on all port.

XXX1: some of these RTC drivers still assume 32bit time_t
XXX2: some of these should be rewritten to use todr_[gs]ettime_ymdhms()
XXX3: todr(9) man page doesn't mention todr_[gs]ettime_ymdhms()

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Switch VAX over to generic TODR

Make yeartonum/numtoyear visible.

Styr upp deklarationen av clockchippsparametrarna.

Add some external variables.

Oops, I forgot to check this file in after clock changes.

Reworked time handling; now also handles clock chip CPUs correctly.