util-linux: remove leftover comment

We no longer have automatic derivation of DEPENDENCIES for host
packages, so the comment that we don't want a host-busybox dependency
is no longer valid.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>