Bumpity bump bump

bump ramdisk sizes by 100kb for GCC 7 bloaty.

branches: 1.25.12;
+= for MAKEFS_FLAGS

branches: 1.24.30; 1.24.34;
Remove terminfo.db as it's now embedded in libterminfo.

Use the rescue terminfo.db in our images instead of termcap.

Bump the ramdisk size so that the contents fits again.
OK'ed by reinoud@

Replace references to local and now no-longer-existing termcap files
with references to ${DISTRIBB}/common/termcap. Hi, abs@!

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

${NETBSDSRCDIR}/distrib/common/protocols => ${DISTRIBDIR}/common/protocols
${NETBSDSRCDIR}/distrib/common/services => ${DISTRIBDIR}/common/services

Alas poor dot.hdprofile. I knew him... not at all Horatio. (Remove)

Use the cutdown distrib/common/services and distrib/common/protocols
rather than the full fat etc versions

Bump image size from 1924k to 2000k to compensate for recent bloat.

branches: 1.15.12; 1.15.14; 1.15.16;
Since /etc/services has gotten rather large, use a minimal one for install
kernels. (mount_nfs is notably the only binary that doesn't gracefully deal
with the lack of an /etc/services file, it appears.)

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

switch to libhack. minor reorder of list

tweak how distrib/Makefile.inc is pulled in

ensure all sysinst-using makefs generated images have at least 15 inodes free,
and be consistent how MAKEFS_FLAGS is defined.

Add 4k to ramdisk image.

parselist.awk
- improve comments
- provide a general purpose variable replacement; replace contents of ${FOO}
with ENVIRON["FOO"].
- deprecate @MACHINE@ and @MACHINE_ARCH@ in favour of using ${MACHINE}
and ${MACHINE_ARCH} instead
- add errx() function; like err(), but doesn't print the line number
- invoke this script with various variables defined via PARSELISTENV

*/Makefile*
- use PARSELISTENV instead of POPULATEENV, and add variables like DESTDIR
- other minor tweaks

*/list*
- replace @MACHINE@ with ${MACHINE}

Update the ramdisk building procedure after tips/hints of luke.

- set IMAGESIZE (grew by 24K) and a few more free inodes, as per discussion
with Reinoud
- minor reorder

restore functionality lost in my previous rototill:
run pwd_mkdb to provide full /etc/{s,}pwd.db rather than using libhack.

xxx; still not tested

Convert to new common ramdisk build infrastructure, which supports
unprivileged cross builds.

XXX: untested as yet; probably needs minor image sizing tweaks

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

Remove some old installation crud and change the terminal setting to vt100

Create initial distribution directory for NetBSD/acorn32. There might be
some unused stuff in there like the floppies but i've left them here for
completion. They might be interesting to build one day too.