Fix build of crunched "route".

branches: 1.17.26;
be a happy crunch build

branches: 1.16.26;
Only support SMALLPROG_INET6 if ${USE_INET6} != "no".
Part of PR 28994.

Rework how SMALLPROG was being used and how INET6 support was enabled.
There's two variables added to Makefile.crunch:

SMALLPROG If 1, add SMALLPROG=1 to CRUNCHENV. [default: 1]
This can be used by various Makefiles to
determine if a `small' version of the program
is required.

SMALLPROG_INET6 If 1 and SMALLPROG == 1, add SMALLPROG_INET6=1
to CRUNCHENV. [default: 0]
This can be used by various Makefiles to
determine if the `small' version has INET6
support enabled.

Only enable SMALLPROG_INET6 for programs on the ramdisks that have INET6 in
the appropriate kernel, and cleanup INET6 setting.
(Note: this means that sysinst won't get INET6 support if the kernel
it's running on doesn't have it).

This change saves a fair bit of space on various install images
(including i386 ramdisk-{ps2,small,tiny}) that didn't have INET6 in
the kernel but were unconditionally getting INET6 support in their tools.

make macppc install floppy IPv6 ready
(we have two floppies anyways, and there's plenty of space in 2nd floppy)

branches: 1.13.2;
Major readability cleanup; nuke redundancies; MKfoo=no -> NOfoo=.

Change all COPTS+=-Os to DBG=-Os as that var actually controls the optimization
levels

Drop ``-Os'' on sparc64 due to toolchain issues.

The same change has already been applied on the 1.5 branch. The problems
(i.e. ifconfig not showing IP addresses) have been verified to still exist
with the new toolchain.

Enable INET6 on x68k.
Use ${MACHINE} instead of ${MACHINE_ARCH}, since the installer is
built per-${MACHINE} based.

branches: 1.9.4;
Part II. Link everything -static since that's what want for crunchgen
later on.

Compile things with -Os. I wonder if compiling -Mno-pic for mips and vax
would shrink them even more?

supply IPv6-ready route(8) for i386 and hpcmips
(those who has IPv6-ready sysinst already)

dependencies on BSDSRCDIR should be _removed_, not introduced. Use
paths relative to ${.CURDIR} instead. Using BSDSRCDIR here means that
it's impossible to compile these programs out of the source tree they're
a part of, unless that sort tree happens to be the one at BSDSRCDIR.

Things in distrib/utils need to know BSDSRCDIR anway,
so we might as well use it. Lots simpler.

convert from NOxxx= to MKxxx=no.
include <bsd.own.mk> if testing a MKxxx variable.

use CPPFLAGS instead of CFLAGS

branches: 1.2.2;
The sources over in ../../../sbin/route/ now do what this wants,
so use those instead of the versions that were copied here.

branches: 1.1.1;
Initial revision