Fix building of gzboot images in the EABI MACHINE_ARCH universe.

branches: 1.27.24;
Use ${TOOL_GZIP_N} instead of ${TOOL_GZIP} -n, and similarly
use ${TOOL_GZIP_N} -9 instead of ${TOOL_GZIP} -9n, etc.

This will pass -nT instead of just -n if the gzip program is
actually pigz.

branches: 1.26.2;
TARGETS -> ARCH_TARGETS

Use ${TOOL_GZIP} instead of just gzip in all Makefiles
outside */dist/* subdirectories.

When USE_PIGZGZIP=yes, bsd.own.mk sets TOOL_GZIP=${TOOL_PIGZ},
so there's no need to test USE_PIGZGZIP in these Makefiles.

Fix the ALL_KERNELS default value assignment, so that the double
quotes don't become a part of the value, causing all the targets
to be skipped by default.

build.sh lets you build releases with a limited set of kernels by
using the ALL_KERNELS environment variable to override the arch default.

Fix this mechanism for evbarm by limiting the generated boot images
accordingly.

branches: 1.22.2;
add phony targets to build gzimg files for specified kernels, instead
of building all gzimg files in TARGETS.

branches: 1.21.6;
Consistently use gzip with the -n flag so dates are not embedded.

Not tested on all platforms.

branches: 1.20.2;
add GEMINI gz image target

branches: 1.19.2;
Change MACHINE to RELEASEMACHINEDIR

branches: 1.18.18; 1.18.22;
Build a gzboot image suitable for CP3100.

Plug Technologic Systems TS-7200 SBC kernels into evbarm release build

add SMDK2800 to supported platform.

Rename a large chunk of the make(1) variables which refer to a
program/tool from "FOO" to "TOOL_FOO". The new variables are:
TOOL_ASN1_COMPILE TOOL_CAP_MKDB TOOL_CAT TOOL_CKSUM TOOL_COMPILE_ET
TOOL_CONFIG TOOL_CRUNCHGEN TOOL_CTAGS TOOL_DB TOOL_EQN TOOL_FGEN
TOOL_GENCAT TOOL_GROFF TOOL_HEXDUMP TOOL_INDXBIB TOOL_INSTALLBOOT
TOOL_INSTALL_INFO TOOL_M4 TOOL_MAKEFS TOOL_MAKEINFO TOOL_MAKEWHATIS
TOOL_MDSETIMAGE TOOL_MENUC TOOL_MKCSMAPPER TOOL_MKESDB
TOOL_MKLOCALE TOOL_MKMAGIC TOOL_MKTEMP TOOL_MSGC TOOL_MTREE
TOOL_PAX TOOL_PIC TOOL_PREPMKBOOTIMAGE TOOL_PWD_MKDB TOOL_REFER
TOOL_ROFF_ASCII TOOL_ROFF_DVI TOOL_ROFF_HTML TOOL_ROFF_PS
TOOL_ROFF_RAW TOOL_RPCGEN TOOL_SOELIM TOOL_SUNLABEL TOOL_TBL
TOOL_UUDECODE TOOL_VGRIND TOOL_ZIC

For each, provide default in <bsd.sys.mk> of the form:
TOOL_FOO?= foo
and for the ${USETOOLS}=="yes" case in <bsd.own.mk>, provide override:
TOOL_FOO= ${TOOLDIR}/bin/${_TOOL_PREFIX}foo

Document all of these in bsd.README.

This cleans up a chunk of potential (and actual) namespace collision
within our build infrastructure, as well as improves consistency in
the share/mk documentation and provision of appropriate defaults for
each of these variables.

Don't build a big-endian image on platforms which don't run big-endian.

Don't build gzboot's separately. Instead, use the concatenate'able
gzboot images that are installed in ${DESTDIR}/usr/mdec. Simplifies
building of these images considerably.

Fixes PR port-arm32/21352.

Fix building of gzimg's (feh, last test build was done from the wrong
source tree).

Build "root on wd0" and "root on sd0" gzboot images for ADI BRH,
IQ80310, and IQ80321. Build "root on sd0" for TEAMASA_NPWR.

Install release files under "${RELEASEDIR}/${MACHINE}/..." instead of
"${RELEASEDIR}/...".

${RELEASEDIR} is never cleaned , and ${RELEASEDIR}/${MACHINE} is only
cleaned if UPDATE is not defined.

improve how gzipping is done to reduce amount of temp files, etc.

Use per-target temp files, rather than sharing the same ones.
Fixes parallel build problem noted by Bill Sommerfeld.

yet another distrib overhaul:
- move guts of distrib/Makefile.inc to distrib/common/Makefile.distrib
(fixes problem caused by implicit include of ../Makefile.inc in certain
submake conditions triggered by makefiles not yet in tree)
- removed mkdir of ${RELEASEDIR}/*; rely upon "snap_pre" target of
etc/Makefile to create all the release directories
- renamed RELINSTALL to RELEASE_INSTALL
- renamed FLOPPYINSTDIR to FLOPPY_RELEASEDIR
- renamed MDSETDIR to MDSET_RELEASEDIR
- removed ITARGET
- move release target from top level to appropriate subdirectory
- ensure release target has correct depends
- replace miniroot's IMAGE_MD_POST with common/Makefile.image IMAGEPOSTBUILD
- Makefile.image: add realall: ${IMAGE}

replace _SRC_TOP_ with NETBSDSRCDIR, since the latter is the "public" version

Allow the name of the gzboot image to be different from the name
of the kernel configuration.

Allow which kernel for a specific kernel config to be specified (e.g.
netbsd-sd0, netbsd-wm0, etc.).

Make the "release" target catch everything we want.

Add back the -f flag to gzip(1) that was erroneously removed in
in the last change.

- move gzboot/gzimg_* into unified gzboot/gzimg/, incorporating gzboot/kern_*
- use NDWO Makefile layout