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

Check l2cap socket initialisation and define L2CAP_SOCKET_CHECKED
This will fix build.

- Add new service class definitions and a new attribute identifier definition
- Update URL of the Assigned Numbers document for SDP

Approved by: emax (mentor)
MFC after: 3 days

Fix an unwanted gcc4 warning.

Submitted by: delphij
MFC after: 3 days

Do not tread 128-bit UUID as int128. Provide separate macros to get/put
128-bit UUID libsdp(3). Fix 128-bit UUID printing in sdpcontrol(8).

MFC after: 3 days

Make sure Bluetooth stuff can be compiled on amd64

Submitted by: ps

Prepare libsdp(3) for the upcoming sdpd import
Also while i'm here s/u_int/uint

Reviewed by: imp (mentor), ru

Fix few typos

Reviewed by: imp, julian, ru
Approved by: imp (mentor)

Update Bluetooth code.

Reviewed by: M. Warner Losh <imp@bsdimp.com>; John Hay <jhay@freebsd.org>
Approved by: M. Warner Losh <imp@bsdimp.com> (mentor)