faccessat(2): Honor AT_SYMLINK_NOFOLLOW

Make the system call honor `AT_SYMLINK_NOFOLLOW`.

Also enable this from `linux_faccessat2` where the issue arised the first time.
Update manual pages accordi

faccessat(2): Honor AT_SYMLINK_NOFOLLOW

Make the system call honor `AT_SYMLINK_NOFOLLOW`.

Also enable this from `linux_faccessat2` where the issue arised the first time.
Update manual pages accordingly.

PR: 275295
Reported by: kenrap@kennethraplee.com
Approved by: kib@
Differential Revision: https://reviews.freebsd.org/D46267

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access(2): Discourage use of these system calls.

Fixes: 421025a274fb
PR: 262895
MFC after: 3 days
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D45240

access.2: Mention that lstat(2) should be used for symbolic links

access(), eaccess() and faccessat() will always dereference
symbolic links.

So add a note in the manual page, that lstat(2) should

access.2: Mention that lstat(2) should be used for symbolic links

access(), eaccess() and faccessat() will always dereference
symbolic links.

So add a note in the manual page, that lstat(2) should be
used in the case of symbolic links.

PR: 262895
Reviewed by: gbe, pauamma_gundo.com
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D44890

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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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