[racket] "file dependency: ..." log messages with PLTSTDERR=info

At Wed, 13 Feb 2013 14:02:21 -0500, Greg Hendershott wrote:
> Yes. If you mean that more of Racket itself (such as cm) should use
> define-logger, I think you have a good point.
>
> There are things like GC that have been using the global logger
> "forever". Maybe changing those would be too difficult. Or perhaps
> (although it's harder for me to imagine) changing those could break
> something that expects the old behavior (??).

We already changed some. The GC messages, for example, go to a logger
named `GC'. I'm not sure whether there are others besides CM
accomplices that need to change.