configure.in: Fix typo: remove '2' from blkid_probe_get_topology2

I think vim <esc>wq turned into <esc>2wq or something; in any case
blkid_probe_get_topology2 is not the right thing to search for.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
diff --git a/configure b/configure
index 3d6c5c8..0ba09bf 100755
--- a/configure
+++ b/configure
Binary files differ