libfrog: remove libxfs.h dependencies in fsgeom.c and linux.c
libfrog isn't supposed to depend on libxfs, so don't include the header
file in the libfrog source code.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Allison Collins <allison.henderson@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eric Sandeen <sandeen@sandeen.net>