libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

pselect(2): Document what a null pointer for the signalmask means

When pselect is passed a null pointer for the signal mask, the standard
says it shall behave like select (except for the different t

pselect(2): Document what a null pointer for the signalmask means

When pselect is passed a null pointer for the signal mask, the standard
says it shall behave like select (except for the different timeout
arg). Make a note of that here.

Sponsored by: Netflix

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use .Mt to mark up email addresses consistently (part4)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

pselect(2): Add xref to sigsuspend(2).

Move pselect(3) man page to section 2.

Noted by: jhb
MFC after: 1 month

Commit libc files missed in r198508

mdoc(7) police: "The .Fn function".

mdoc(7) police: overhaul.

Approved by: re

Add restrict type-qualifier.

Actually document pselect(3) so that Bruce can mention it in the release
notes. :-)