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

/* -> /*- for copyright notices, minor format tweaks as necessary

Fix typo in the BSD copyright: s/withough/without/

Spotted and suggested by: des
MFC after: 3 weeks

Fix typo: compatability -> compatibility.

Compatability is not an existing english word.

$Id$ -> $FreeBSD$

Moved misplaced idempotency ifdef. Multiple inclusion was fatal since
there was a typedef outside the ifdef.

Fixed syntax error after the #endif for this ifdef.

Didn't fix the usual style bugs for this ifdef...

New defines for the Wavelan (wl) driver.
Submitted by: Jim Binkley <jrb@cs.pdx.edu>

Add 'wl' Wavelan driver.
Obtained from: Jim Binkley <jrb@cs.pdx.edu>