[racket] Code compiled for version ~a, not ~a

From: Guillaume Marceau (gmarceau at gmail.com)
Date: Sat Sep 17 19:49:42 EDT 2011

I test my code against the many different versions of DrRacket, which 
means I switch version several times a day.

Each time I launch a different version of DrRacket, I inevitably forget 
to recompile some library that's in my PLTCOLLECTS, or in my raco link 
table, which means I get lots of "code compiled for version ~a, not ~a" 

Is there a way to tell Racket to go ahead and recompile these zos as it 
finds them?

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