sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Revert r229954 which in turn had reverted r228556 in projects/bhyve.

This was done to work around build issues when building projects/bhyve on an
8.x system at the time.

The workaround is no longer needed so re-instantiate r228556 in projects/bhyve.

Discussed with: grehan@
Obtained from: NetApp

Revert r228556 - this breaks building on 8.*, and I still use these
systems daily to do CURRENT development.

Add "%option noinput" to aicasm_scan.l and aicasm_macro_scan.l, so no
unneeded input functions will be emitted.

Spotted by: arundel
MFC after: 1 week

Improve portability #defines for compiling aicasm on other systems.

Submitted by: Robert Millan rmh debian.org
Obtained from: Debian GNU/kFreeBSD

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Revert r213765. This is required because our build infrastructure uses
the host lex instead of the lex built during buildworld. I will MFC the
lex changes soon and in a few weeks this I'll commit again r213765.

Define YY_NO_INPUT. This makes aicasm buildable by clang with Werror
turned on.

MFC r201261:
Add missing `void' keywords.

Add missing `void' keywords.

Code cleanups to make this WARNS=6 clean.

PR: bin/96128

- Import the HEAD csup code which is the basis for the cvsmode work.

Start each of the license/copyright comments with /*-, minor shuffle of lines

Modify assembler to ignore carriage returns in input.
This should make those using the assembler under cygwin
happy.

Remove redundant inclusion of inttypes.h in aicasm_gram.y
and properly sort inttypes.h into list of includes.

Noticed by: Mike Barcroft <mike@freebsd.org>

Use inttypes.h

Upgrade assembler to allow a move immediate of 0.
This is helpful in certain macros where we can't know the value of the
immediate in advance.

Update assembler syntax and assembler to allow generation of register
description tables used for diagnostic "pretty printing".

Add macro functionality.

Staticize and allow unique naming of data structures so that more
than on sequencer program can be statically compiled into the kernel
at a time.