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 it possible to use acl_create_entry_np(3) to use first entry to an
empty ACL, and to append an entry to an ACL.

Submitted by: sef@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

The 'acl_cnt' field is unsigned; no point in checking if it's >= 0.

Found with: Coverity Prevent
CID: 6192

The 'acl_cnt' field is unsigned; no point in checking if it's >= 0.

Found with: Coverity Prevent
CID: 6193

Add NFSv4 ACL support to libc.

This adds the following functions to the acl(3) API: acl_add_flag_np,
acl_clear_flags_np, acl_create_entry_np, acl_delete_entry_np,
acl_delete_flag_np, acl_get_extended_np, acl_get_flag_np, acl_get_flagset_np,
acl_set_extended_np, acl_set_flagset_np, acl_to_text_np, acl_is_trivial_np,
acl_strip_np, acl_get_brand_np. Most of them are similar to what Darwin
does. There are no backward-incompatible changes.

Approved by: rwatson@

Fix off by one error in acl_create_entry(3).

Reviewed by: rwatson@
MFC after: 2 weeks

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

Reviewed by: rwatson

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

o style and consistency fixes:
- if (!var) -> if (var == NULL)
- return val; -> return (val);
o update copyright

o Separate acl_t into internal and external representations as
required by POSIX.1e. This maintains the current 'struct acl'
in the kernel while providing the generic external acl_t
interface required to complete the ACL editing library.
o Add the acl_get_entry() function.
o Convert the existing ACL utilities, getfacl and setfacl, to
fully make use of the ACL editing library.

Obtained from: TrustedBSD Project

Add the remaining POSIX.1e ACL definitions:
ACL_UNDEFINED_TAG, ACL_UNDEFINED_ID, ACL_FIRST_ENTRY, ACL_NEXT_ENTRY

Reviewed by: rwatson
Obtained from: TrustedBSD Project

Revamp acl_create_entry() so it actually works.

Obtained from: TrustedBSD Project

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

Add the following ACL editing functions:
acl_add_perm, acl_clear_perms, acl_copy_entry, acl_create_entry,
acl_delete_perm, acl_get_permset, acl_get_qualifier, acl_get_tag_type,
acl_set_permset, acl_set_qualifier, acl_set_tag_type

This brings us within 4 functions of a full ACL editing library.

Reviewed by: rwatson