mandoc: Drop -ieee754-2008 abbreviation

Improve manpage compatability by dropping an abbreviation macro that
compiler upstreams do not want, causing manuals using it to render
incorrectly on other t

mandoc: Drop -ieee754-2008 abbreviation

Improve manpage compatability by dropping an abbreviation macro that
compiler upstreams do not want, causing manuals using it to render
incorrectly on other toolchains or operating systems. It was only used
in three manuals, which are amended in this commit.

Reviewed by: fuz, markj
MFC after: no, these did not MFC
Requested by: Ingo Schwarze <schwarze@openbsd.org>
Fixes: db3884b03989 ("contrib/mandoc: add -ieee754-2008")
Fixes: 63cd0841de76 ("document .St -ieee754-2008 in mdoc")
Differential Revision: https://reviews.freebsd.org/D59880

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Add sysconf(8) and libbsdconf(3)

Complete the native configuration trinity: sysctl(8) for live kernel
state, sysrc(8) for rc.conf(5), and sysconf(8) for the remaining base
configuration -- loader.co

Add sysconf(8) and libbsdconf(3)

Complete the native configuration trinity: sysctl(8) for live kernel
state, sysrc(8) for rc.conf(5), and sysconf(8) for the remaining base
configuration -- loader.conf(5), sysctl.conf(5), and the make.conf(5)
family -- atop libbsdconf(3).

libbsdconf resurrects figpar as a unified reader/writer. Callbacks own
semantics; statements may span multiple lines via backslash continuation;
non-seekable input is spooled; writes are atomic (mkstemp, fsync, rename)
with mode/owner preservation. Format descriptors name each target, its
files, and quoting rules without private parsers. Multi-file targets
follow boot sourcing order; loader chases loader_conf_files as the boot
loader does.

sysconf(8) is the operator-facing tool: name / name=value on a required
target, sysrc-style list edits, make append and list-strike where they
belong, jail/altroot, and a capsicum sandbox for read-only use.

Sysctl writes validate against the running kernel first -- unknown and
read-only OIDs, CTLFLAG_TUN (pointing at the loader target), and CTLTYPE
range checks -- so a typo or overflow does not land in sysctl.conf.

Make and src treat WITH_/WITHOUT_ as presence knobs (as bsd.mkopt.mk /
src.conf(5) do) and warn on the WITH_*=no form that does not disable the
option, so a bad assignment is caught before an /usr/src build surfaces
it.

The rc target passes through to sysrc(8).

Defaults querying (-d/-D/-A) mirrors sysrc for dumps and descriptions on
targets that have a defaults file; named reads already see defaults, and
-A only widens dump scope.

Manuals are split pkg(8)-style (bsdconf/put/format; sysconf plus
per-target pages). ATF coverage exercises the frontend.

Co-authored-by: Faraz Vahedi <kfv@FreeBSD.org>
Reviewed by: fuz, kfv
Differential Revision: https://reviews.freebsd.org/D58066

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