libfrog: always use the kernel GETFSMAP definitions

libfrog: always use the kernel GETFSMAP definitions

The GETFSMAP ioctl has been a part of the kernel since 4.12.  We have no
business shipping a stale copy of kernel header contents in the xfslibs
package, so get rid of it.  This means that xfs_scrub now has a hard
dependency on the build system having new kernel headers.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>