Jack Nagel c13311ca09 Cache MacOS.version comparison results
MacOS.version#<=> is called many, many times during formula loading with
the same half dozen or so arguments. A typical call to this method
involves:

 * a hash lookup to convert a symbol argument to a string
 * creation of a throw-away Version object wrapping the argument
 * the actual version comparison, which is not cheap

This makes it a prime candidate to be memoized.
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