Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

targets: Catch up with the removals of mips and sparc64

Update/fix Makefile.depend for userland

Remove kgzip and kgzldr.

PR: 183666, 229763
Submitted by: Yoshihiro Ota <ota at j.email.ne.jp>
Differential Revision: https://reviews.freebsd.org/D20248

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix

DIRDEPS_BUILD: Connect new directories.

Sponsored by: Dell EMC Isilon

Remove pc98 support completely.
I thank all developers and contributors for pc98.

Relnotes: yes

DIRDEPS_BUILD: Connect new dependencies.

MFC after: 2 weeks
Sponsored by: Dell EMC Isilon

Update i386 build of loader.efi (but leave it disabled) so that we at
least build it now.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D7801

DIRDEPS_BUILD: Fix and hookup rescue/rescue to the build.

Sponsored by: EMC / Isilon Storage Division

DIRDEPS_BUILD: Update dependencies.

Sponsored by: EMC / Isilon Storage Division

Restore kgzldr on i386 only

I previously disconnected kgzdr based on a misunderstanding.

I'd still like to transition to supporting only the loader(8)-based
boot path for handling compressed kernels, but that can follow the
standard deprecation procedure.

This reverts r291113.

Requested by: dteske

rescue/rescue does not yet build in meta mode.

META MODE: Update dependencies with 'the-lot' and add missing directories.

This is not properly respecting WITHOUT or ARCH dependencies in target/.
Doing so requires a massive effort to rework targets/ to do so. A
better approach will be to either include the SUBDIR Makefiles directly
and map to DIRDEPS or just dynamically lookup the SUBDIR. These lose
the benefit of having a userland/lib, userland/libexec, etc, though and
results in a massive package. The current implementation of targets/ is
very unmaintainable.

Currently rescue/rescue and sys/modules are still not connected.

Sponsored by: EMC / Isilon Storage Division

Disconnect unused kgzldr from sys/boot/i386

Sponsored by: The FreeBSD Foundation

Remove unsupported ia64.

Sponsored by: EMC / Isilon Storage Division

META_MODE: Remove DEP_RELDIR from Makefile.depend files.

This has not been needed since r284171 in projects/bmake.

Sponsored by: EMC / Isilon Storage Division

Reorganize targets/pseudo/userland

This target mainly exists to help check things build.
Eventually targets that build real packages or images will be more
important.
As such move the pseudo targets that only exist for the benefit of
'userland' to under it.