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

Fix acl_strip_np(3) breakage introduced in r279962.

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

libc: plug memory leaks in edge cases for the posix1e code.

CID: 1016705
CID: 1016706
CID: 1016707

Differential Revision: https://reviews.freebsd.org/D2023

Move the code around so that libc behaviour does not depend on a variable
that was supposed to be kernel-only. There should be no functional changes.

Make acl_strip_np(3) use new trivial ACL format for NFSv4 ACls (three
entries instead of six). This makes "setfacl -b" do the right thing
for ACLs on ZFS. UFS recognizes both kinds of trivial ACLs; no change
there.

MFC after: 2 months

First step at adopting FreeBSD to support PSARC/2010/029. This makes
acl_is_trivial_np(3) properly recognize the new trivial ACLs. From
the user point of view, that means "ls -l" no longer shows plus signs
for all the files when running ZFS v28.

Arrgh, tested wrong source tree _again_. Fix previous commit. Also,
this and previous one are MFC candidate.

MFC after: 1 month

Add minor optimization. It's less strict than its kernel counterpart
due to upcoming ACL changes required by the new ZFS.

Fix usage of uninitialized variable.

Found with: Coverity Prevent
CID: 7517
MFC after: 2 weeks

Switch to our preferred license text.

Approved by: jedgar

Fix c194955 - somehow I managed all the new files, tripling their
contents.

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@