fixed futures (processor-count) on OS X (was previously always returning 1)
fixed futures (processor-count) on OS X (was previously always returning 1)

svn: r16924

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket