[racket] Override default collects directory with another

I think you want to set the `PLTCOLLECTS' environment variable.

At Tue, 9 Oct 2012 18:15:20 -0600, Kieron Hardy wrote:
> Hi all,
> 
> Does anyone know how to setup so that racket/DrRacket will use a different
> collects directory than the default, i.e. override the collects directory
> released with that version of racket/DrRacket?
> 
> Specifically, I'm trying to debug an issue with the GUI, and want to
> switch/checkout from github to a series of specific commit points, starting
> DrRacket each time to find out when the problem was introduced. I don't yet
> have a proper build environment, and was hoping to put off getting one
> setup on Windows for a little while longer yet.
> 
> Cheers,
> 
> Kieron.
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