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timecounting: deprecate time_second(9), time_uptime(9)

time_second(9) has been replaced in the kernel by gettime(9).
time_uptime(9) has been replaced in the kernel by getuptime(9).

New code should use the replacement interfaces.  They do not suffer
from the split-read problem inherent to the time_* variables on 32-bit
platforms.

The variables remain in sys/kern/kern_tc.c for use via kvm(3) when
examining kernel core dumps.

This commit completes the deprecation process:

- Remove the extern'd definitions for time_second and time_uptime
  from sys/time.h.
- Replace manpage cross-references to time_second(9)/time_uptime(9)
  with references to microtime(9) or a related interface.
- Move the time_second.9 manpage to the attic.

With input from dlg@, kettenis@, visa@, and tedu@.

ok kettenis@

.\"	$OpenBSD: inittodr.9,v 1.12 2020/06/26 18:48:31 cheloha Exp $
.\"	$NetBSD: inittodr.9,v 1.2 1996/03/27 21:16:06 jtc Exp $
.\"
.\" Copyright (c) 1994 Christopher G. Demetriou
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgement:
.\"      This product includes software developed by Christopher G. Demetriou
.\"      for the NetBSD Project.
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.Dd $Mdocdate: June 26 2020 $
.Dt INITTODR 9
.Os
.Sh NAME
.Nm inittodr
.Nd initialize system time
.Sh SYNOPSIS
.Ft void
.Fn inittodr "time_t base"
.Sh DESCRIPTION
The
.Fn inittodr
function determines the time and sets the system clock.
It tries to pick the correct time using a set of heuristics that examine
the system's battery-backed clock and the time reported by the file
system, as given in
.Fa base .
Those heuristics include:
.Bl -bullet
.It
If the battery-backed clock has a valid time, it is used.
.It
If the battery-backed clock does not have a valid time, and
the time provided in
.Fa base
is within reason,
.Fa base
is used as the current time.
.It
If the battery-backed clock appears invalid, and
.Fa base
appears nonsensical or was not provided (was given as zero),
an arbitrary base (typically some time in the late 1970s)
will be used.
.El
.Pp
Once a system time has been determined, it is passed to the
.Fn tc_setclock
function.
.Sh DIAGNOSTICS
The
.Fn inittodr
function prints diagnostic messages if it has trouble figuring
out the system time.
Conditions that can cause diagnostic messages to be printed include:
.Bl -bullet
.It
The battery-backed clock's time appears nonsensical.
.It
The
.Fa base
time appears nonsensical.
.It
The
.Fa base
time and the battery-backed clock's time differ by a large amount.
.El
.Sh SEE ALSO
.Xr microtime 9 ,
.Xr resettodr 9
.Sh BUGS
Each system's heuristics for picking the correct time are slightly
different.