update from 6 to 7 - needs libtool rebuild

[Lowell Gilbert]

John Hein <jhein at timing.com> writes:

> I often don't rebuild everything right away and live with the compat
> libs for a while.
>
> That has worked fine in the past (probably had some hiccups that I've
> long since forgotten about).  But I understand why the official
> position is to rebuild everything.

There's no hurry until you start updating *some* ports.  Then you want
to upgrade everything, because it's so easy to end up linked against
more than one version of the same library.