[racket] Mac OS X x86_64 build

From: Eli Barzilay (eli at barzilay.org)
Date: Thu May 12 22:36:47 EDT 2011

Thanks to Stephen De Gabrielle, there is now an x86_64 build for OS X.
(The build machine has some lion version, in case it makes any
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!

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