Add /dev/pipe to the spec list using IMAGESPECEXTRA

make this build with GCC 10.

change makefs flags from:
density=2048
to:
density=3072,bsize=4096,fsize=512,optimization=space

so that everything fits again. add some comment GCC flags
that may help reduce size a little more.

Drop IEEE802.11 support from the ramdisk's ifconfig(8)

+= for MAKEFS_FLAGS

branches: 1.24.2; 1.24.4;
mark fstab .PHONY to prevent it being re-made from fstab.c in suffix rules.

Nothing needs disktab anymore, so we'd rather have an inode and
slightly over 1K of space on install media...

Move sun2, sun3 & x68k across to the common distrib etc/services, and
while here reduce it from 1180 to 794 bytes (whitespace & comment cleanup)

Bump miniroot size from 500k to 600k to compensate for recent bloat.

branches: 1.20.2;
Shrink ramdisk to 500k again.
The crunched binary with optimized libraries fits it.

Bump the ramdisk from 500k to 700k to compensate for bloat which
happened while the sun2 kernels were unbuildable.

branches: 1.18.12; 1.18.14;
Remove a duplicated option in MAKEFS_FLAGS.
"minfree=0,optimization=space" is defined at
../../common/Makefile.image.

ramdisk doesn't fit in 400k anymore, make it 500k.

__ramdisk MAKEDEV target is no more

Add support for UFS2. UFS2 is an enhanced FFS, adding support for
64 bit block pointers, extended attribute storage, and a few
other things.

This commit does not yet include the code to manipulate the extended
storage (for e.g. ACLs), this will be done later.

Originally written by Kirk McKusick and Network Associates Laboratories for
FreeBSD.

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

move files from ../common/ that are only used in this directory to here

convert to be closer to the other distrib dirs:
- take advantage of Makefile.mdset
- use list instead of ramdisk.list, and remove special srcdirs for init
and dd since they understand -DSMALLPROG
- use full-path style specfile mtree.conf instead of
old-style specfile ../common/ramdisk.tree
- ensure IMAGEDEPENDS is in sync with list
(xxx; untested :)

Converted sun2 to the new distrib world order. It is now
possible to do full release unprivileged cross-builds.

Set DBG=-Os for libhack.

- Be consistent how libhack is used: If extra HACKOBJS (e.g., gethost.o) are
required, define them before pulling in libhack/Makefile.inc so that the
dependencies work correctly.
- Other minor cleanups

Note that libhack.o depends on gethost.o, otherwise
the latter won't get built.

Disable libhack's gethost.o (replacement gethostby{name,addr}()) by default,
as they only support reading /etc/hosts, and its the "least useful" of
the libhack routines. Add gethost.o back to Really Small media which
appears to need the space savings.

replace local ${REV} with ${DISTRIBREV} from distrib/Makefile.inc

Sync with the sun3 distrib code, and fixed many problems
to the point where this is truly useful for building
sun2 releases.

Convert to using ${MDSETIMAGE}.

Provide a default value for $MDSETIMAGE and pull in bsd.own.mk to have
it overriden as needed for cross/-current builds.

Add MTREE?= to add Makefiles and use when running mtree

Added sun2 distrib files.