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

MFC r322925:
libc: minor indent(1) cleanups.

Illumos and Schillix are adopting some of the locale code and our style(9)
sometimes matches the Solaris cstyle, so the changes are also useful as a
way to reduce diffs.

No functional change.

MFC r322368, r322371:
fnmatch(3): improve POSIX conformance.

In a recent interpretation[1], "\\" shall return a non-zero value
(indicating either no match or an error).

The fix involves a change over r254091 and now the behavior matches the
Sun/IBM/HP closed source implementations and also likely musl libc.

Submitted by: Joerg Schilling <joerg at schily.net>

[1] http://austingroupbugs.net/view.php?id=806

MFC r302824

1) Eliminate possibility to call __*collate_range_cmp() with inclomplete
locale (which cause core dump) by removing whole 'table' argument
by which it passed.

2) Restore __collate_range_cmp() in __sccl().

3) Collating [a-z] range in regcomp() work only for single bytes locales
(we can't do it now for other ones). In previous code only first 256
wchars are considered and all others are just silently dropped from the
range.