Please update addaddmul_1msb0.asm to support ABI in mingw64

[Niels Möller]

Marco Bodrato <bodrato at mail.dm.unipi.it> writes:

> I agree. Let's choose between the two last versions, and I'll push it.

Nice with a few instructions less, feel free to push the version you
like best.

Regards,
/Niels

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