Only report not using latest versions when using < latest

Rather than when /= latest. So we'll no longer report things like:

  hdevtools-0.1.0.6 (latest: 0.1.0.5) (new package)

We don't need to tell people they're not using the latest version when
they're actually using a later version than the one available (e.g.
it's installed locally and not available from the remote server).

Reported by bennofs