[racket] Using define-runtime-path from *SL

How can I use define-runtime-path from *SL? I have a little teachpack that
exports the play-sound/play-background-sound functions so students can use
that in a game, but when you create an executable the sound files are not
packaged up. I figured that define-runtime-path needs to be used for that,
but exporting that from the teachpack gives an error when you try to use it
from a *SL program.

--- nadeem
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