bsd.own.mk: rename GCC_NO_* to CC_WNO_*

Rename compiler-warning-disable variables from
GCC_NO_warning
to
CC_WNO_warning
where warning is the full warning name as used by the compiler.

GCC_NO_IMPLICIT_FALLTHRU is CC_WNO_IMPLICIT_FALLTHROUGH

Using the convention CC_compilerflag, where compilerflag
is based on the full compiler flag name.

introduce some common variables for use in GCC warning disables:

GCC_NO_FORMAT_TRUNCATION -Wno-format-truncation (GCC 7/8)
GCC_NO_STRINGOP_TRUNCATION -Wno-stringop-truncation (GCC 8)
GCC_NO_STRINGOP_OVERFLOW -Wno-stringop-overflow (GCC 8)
GCC_NO_CAST_FUNCTION_TYPE -Wno-cast-function-type (GCC 8)

use these to turn off warnings for most GCC-8 complaints. many
of these are false positives, most of the real bugs are already
commited, or are yet to come.


we plan to introduce versions of (some?) of these that use the
"-Wno-error=" form, which still displays the warnings but does
not make it an error, and all of the above will be re-considered
as either being "fix me" (warning still displayed) or "warning
is wrong."

branches: 1.18.28;
This change arm, armeb, earm, earmeb, earmhf, earmhfeb so all builds that
share a MACHINE_ARCH for userland so that except for etc, will produce
identical sets.

usr/include/machine now points to usr/include/arm

branches: 1.17.6; 1.17.12;
System utilities, boot programs and kernel modules are machine
(port) specific not CPU, so use MACHINE not MACHINE_ARCH.

Convert more MACHINE tests to MACHINE_ARCH

branches: 1.15.16; 1.15.20;
Added zaurus.

build the apm utility on sparc since we already build apmd

add hpcsh

Enabled apm command device node for hpcmips and put apm.8 and zzz.8 man pages
into mi directory.

use NETBSDSRCDIR as appropriate

Initial support for APM on hpcarm (just enough to get battery state)

userland access to apm emulation.

use CPPFLAGS instead of CFLAGS

branches: 1.7.2;
enable WARNS=1 by default, but disable in unclean 3rd party code

replace -W flags in CFLAGS with WARNS?=1, cleanup

decend all subdirs for man pages.

Back out the .PATH.c changes. The .depend problem (and others)
will be fixed using the new .NOPATH make feature instead.

Use .PATH.c: ...

Makefile cleanups

add Advanced Power Management driver
Includes bootstrap support from FreeBSD (Tatsumi HOSOKAWA and <ukai>)