swapon: add -f/--fixpgsz option

swapon: add -f/--fixpgsz option

The patch:

	commit 3399a218f4eff4016a22044e7c416521bc37c53c
	Author: Matthias Koenig <mkoenig@suse.de>
	Date:   Thu Nov 27 12:32:56 2008 +0100
	swapon: add swap format detection and pagesize check

introduced a new feature. This feature should be optional (disabled by
default) to keep happy people who use swap-space bad blocks or
nonstandard swap-space size.

CC: Hugh Dickins <hugh@veritas.com>
CC: Olaf Hering <olh@suse.de>
CC: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Karel Zak <kzak@redhat.com>