LU-4602 utils: do not include <linux/fs.h>

LU-4602 utils: do not include <linux/fs.h>

in some case (e.g. cross-compilation on OS/X) MS_* are
defined before linux/fs.h. so do not try to re-define
them.

Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Change-Id: I9ea8ea4865aa0380d7556b88604ec563acb0562b
Reviewed-on: http://review.whamcloud.com/9190
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>