BUG: random: Don't return negative values from Generator.geometric.

In C, when the integer part of a double exceeds the maximum int64, casting
the double to int64_t is undefined behavior.  On some platforms, the result
is 2**64-1 and on others it is -2**64.  That results in rng.geometric()
returning -2**64 when p was sufficiently small on some platforms.

The fix is to never invoke undefined behavior by ensuring we don't attempt
to cast very large double values to int64_t.

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