mini-gmp mpz_gcdext Bézout coefficients do not match documentation

[Niels Möller]

marco.bodrato at tutanota.com writes:

> The only reason why I prefer my solution is: when cmp<0, there is no need to compute
> mpz_sub (t1, t0, t1);

That's certainly a micro optimization, but let's keep things simple.

I've pushed this fix now, I think there were only comment and ChangeLog
changes since the previous version of the patch.

Thanks for the review,
/Niels

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