ilogbl(0.0L) value is wrong

[Bruno Haible]

Hi Corinna,

> I pushed this patch:
> 
>   https://sourceware.org/git/?p=newlib-cygwin.git;a=commitdiff;h=29ba52da9553
> 
> Please test the latest developer snapshot from https://cygwin.com/snapshots/

I can't test it easily.

But the code looks good; only the comments could be improved; patch attached.

Bruno
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