[racket] tool warnings from raco

Do you have any links that were installed via `raco link` instead of
`raco pkg`, such as a link from developing "pollen" before the package
system?

At Sun, 27 Apr 2014 15:12:44 -0700, Matthew Butterick wrote:
> When I invoke raco from the command line, it throws the warning:
> 
> > warning: tool "pollen" registered twice: "pollen" and #<path:/path/to/pollen>
> 
> 
> This error also appeared on racket-dev in Jul 2013. At that time Matthew Flatt 
> said:
> > I changed `raco setup' to use relative paths for the info-domain cache,
> > but not to prune away the old absolute paths.
> > 
> > For now, you can delete "racket/lib/info-cache.rktd", and I'll work on
> > a repair to `raco setup'.
> 
> 
> But though I've tried deleting info-cache.rktd, the warning eventually returns.
> 
> The problem doesn't surface with other packages. It doesn't seem to affect how 
> anything works.
> 
> It also might be a bug in this particular package, though I'm not clear how a 
> package can mess with raco's registration scheme.
> 
> 
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