[racket] Configuring packages' search paths for dynamically linked libs

Briefly: I'd like Racket + its packages to know where (e.g.) the latest
Cairo libraries are, but I also want most of my other software continue to
use an older version of Cairo.

If anyone can point me to the relevant section of documentation I'd be
awfully grateful.

And if what I'm trying to do is unusual or unclear, I'll be happy to
provide more detail.

--Josh
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