metamode recursive descent change

Greetings,

I've been running with this patch  https://reviews.freebsd.org/D37071 for a
little while. In meta mode, it will suppress printing of ==> for the
recursive descent, as well as most of the -- xxx -- lines associated with
that. It does so only in meta mode.

This reduces the noise of metamode builds, makes them run faster (way less
output) and highlights better the always rebuilt stuff, which should help
get those items fixed.

It does represent a behavior change, so I thought I'd send a heads up here
and see what people think...

Warner