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.

make umount NAME= work

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;
Instead of borrowing the mount code to get the nfs arguments, just use
the system call directly. It is shorter and works...

Use the protocol we mounted the filesystem with instead of always udp.
(untested, but should fail back to udp).

Izumi Tsutsui pointed out that we don't need vfslist.c (from ../mount)
if we are defining SMALL.

Set -DSMALL if SMALLPROG defined - ie building install ramdisk images.
Removes the code that uses rpc to query remote systems about nfs mounts.
The last references to the xdr routines escape - saving 64k+

WARNS=2 is the default defined in sbin/Makefile.inc. (thanks wiz)

Remove main() prototype; WARNS=2

Use ${NETBSDSRCDIR}/some/path instead of ${.CURDIR}/../../some/path

CFLAGS->CPPFLAGS

resolve conflicts from lite-2 merge

convert to new RCS Id conventions; reduce my headache

specify man pages the new way.

Fix a couple of Makefile bogons.

Update from 4.4-Lite, with local changes.

there is no librpc any more

Add RCS indentifiers.

changed "Id" to "Header" for rcsids

added rcs ids to all files

branches: 1.1.1;
Initial revision