[issue22486] Add math.gcd()

[Mark Dickinson]

Mark Dickinson added the comment:

> I mean, there is already such a type check in Fraction.__init__()

That type-check doesn't protect us from non-int Integrals, though, as far as I can tell.  It looks to me as though doing `Fraction(numpy.int32(3), numpy.int32(2))` would fail with a TypeError after this patch.  (It works in Python 3.4.)

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