[racket] Mac OS X x86_64 build

[Eli Barzilay]

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
difference.)
-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!
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