bug in longlong.h for aarch64 sub_ddmmss

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

> The two - signs ought to be ~, I think.  Let me think a buit more about that.

If I remember ARM conventions correctly, subtract with carry is defined
as

  {cout, r} = a + ~b + cin

Regards,
/Niels

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