fix typo

newfs_v7fs(8)'s -v and -P options are obsolete. changed to newfs(8) compatible -V option.

Fix warning message.

Check whether superblock is writable sector.

Fixed the problem that partition size over 8GiB(v7fs filesystem limit) failed newfs.

Use howmany() macro as it is used in a lot fo places in this tool anyway
as suggested by Tsugutomo Enami.

Allow cross-compiling from Linux

Don't use roundup2(9) (which should have been howmany(9) anyway) to
fix builds on platforms other than NetBSD.

In sources that get compiled into the tools version of makefs, add:

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

This should fix cross-build problems, but I can't really test
that now

In sources that get compiled into the tools version of makefs, add:

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

This should fix cross-build problems, but I can't really test
that now, so I am not re-enabling the inclusion of v7fs support
in makefs.

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fix freeblock count bug.

7th Edition(V7) File System support. and NetBSD symbolic-link, socket, FIFO extension. see newfs_v7fs(8).