volume 8 instead of volume 1.

Reviewed by:	imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D13370

This simplifies make logic/output

MFC after:	1 month
Sponsored by:	Dell EMC Isilon

I thank all developers and contributors for pc98.

Relnotes:	yes

fdcontrol/fdcontrol.c:
	- Add const constraint to an intermediate value
	  which is not supposed to be changed elsewhere.
fdread/fdread.c:
	- Use _devname in favor of devname to avoid name
	  conflicit.
	- -1 is less than any positive number so in order
	  to get the block to function, we should get the
	  block a little earlier.
	- Cast to remove signed when we are sure that a
	  return value is positive, or is compared with
	  an positive number (tracknumber of a floppy
	  disk is not likely to have UINT_MAX/2 anyway)
fdread/fdutil.c:
	- Use more specific initializer
fdwrite/fdwrite.c:
	- Use static on format_track since it's not
	  referenced in other places.
	- Use const char* to represent string constant.

Bump WARNS accordingly.

Submitted by:	Watanabe Kazuhiro <CQG00620@nifty.ne.jp> (mostly)

These are not perfectly in agreement with each other style-wise, but they
are orders of orders of magnitude more consistent style-wise than before.

While here, removed the GCCism (replaced with WARNS?=1).

give a bit more information about up to 10 errors encountered during
formatting (unless -q has been specified, of course).

While being here, removed a bitrotten comment in the Makefile, and
kill the old Emacs local variable stuff at the end of fdformat.c
that's no longer useful anway.