volume 8 instead of volume 1.

Reviewed by:	imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D13370

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.

No functional change intended.

Sponsored by:	Dell EMC Isilon

This simplifies make logic/output

MFC after:	1 month
Sponsored by:	Dell EMC Isilon

I thank all developers and contributors for pc98.

Relnotes:	yes

malloc and realloc will return NULL pointer if it can't alloc memory.

MFC after:	4 weeks

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp