msvcrt: Fix _copysign bugs for NAN/INF

[Zheng Chen]

Hi Piotr,

looks like your email client has destroyed the patch (line wraps). You can
> solve it by e.g. attaching the patch to email.
>
> I used the Gmail website... maybe there is a problem there. I've resent
those patches. Thanks for noticed.

Rgards,
Zheng
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