Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Make 'struct acl' larger, as required to support NFSv4 ACLs. Provide
compatibility interfaces in both kernel and libc.

Reviewed by: rwatson

Update libc POSIX.1e code and documentation to reflect:

- Updated copyrights, modified dates
- Remove "BUGS" entry indicating that ACLs are unimplemented
- Implement acl_*_link() library wrapper variants for get, set,
delete, aclvalid.
- Document acl_*_link() calls.

Obtained from: TrustedBSD Project

Fix the style of the SCM ID's.
I believe have made all of libc .c's as consistent as possible.

Prepare for the inclusion of libposix1e into libc: retire the old
Makefile, add Makefile.inc needed for libc build; add
#include "namespace.h"/#include "un-namespace.h" pairs around the
includes of sys/acl.h and sys/capability.h, and an additional underscore
in front of the functions that will be overridden in libc_r.

Approved by: rwatson
Obtained from: TrustedBSD Project

o Update copyright dates.
o Rename internal library functions so that they are prefixed with
_posix1e or _POSIX1E, removing them from the application namespace (and
potential conflict with other ACL functions elsewhere in the system).

Obtained from: TrustedBSD Project

Minor fixes to library interface to improve POSIX.1e compliance. This
adds _np to a couple of function prototypes that provided more broad/useful
interfaces than POSIX.1e interfaces included.

Also, move from using a heuristic to identify POSIX.1e-semantic ACLs to
using different ACL types for non-POSIX.1e ACLs. This should clean up the
existing fuzzy logic that determined when acl_sort() should be applied
before kernel submission.

Fix bde'isms in acl/extattr syscall interface, renaming syscalls to
prettier (?) names, adding some const's around here, et al.

This is commit 4 out of 3, updating the userland library to reflect kernel
interface changes.

Reviewed by: bde

acl_delete_default_file() changed to acl_delete_def_file()

libposix1e provides userland library calls for the POSIX.1e security
interface. This commit introduces the library, as well as a modest
subset of the ACL calls, with some modifications to support multiple
ACL semantics.

Reviewed by: eivind