libfrog: define LIBFROG_BULKSTAT_CHUNKSIZE to remove dependence on XFS_INODES_PER_CHUNK

libfrog: define LIBFROG_BULKSTAT_CHUNKSIZE to remove dependence on XFS_INODES_PER_CHUNK

"Online" XFS programs like scrub have no business importing the internal
disk format headers to discover things like the optimum number of inodes
to request through a bulkstat request.  That number can be derived from
the ioctl definition, so define a new constant in terms of that instead
of pulling in the ondisk format unnecessarily.

Note: This patch will be needed to work around new definitions in the
bigtime patchset that will break scrub builds, so clean this up instead
of adding more #includes to the two scrub source files.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>