fix inaccuracy of j0f for x >= 2^127 when sin(x)+cos(x) is tiny

[Andreas Schwab]

On Jul 28 2020, Paul Zimmermann wrote:

> +                  /* we subtract (exactly) a value x0 such that cos(x0)+sin(x0)
> +                     is very near from 0, and use the identity

Did you mean "near to"?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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