strtod ("nan") returns negative NaN

[Masamichi Hosoda]

>>> On Mon, 13 Aug 2018 at 19:46, Duncan Roe <duncan_roe@optusnet.com.au> wrote:
>>>>
>>>> On Mon, Aug 13, 2018 at 12:52:48PM -0400, Stephen John Smoogen wrote:
>>>> > On Mon, 13 Aug 2018 at 11:16, Masamichi Hosoda <trueroad@trueroad.jp> wrote:
>>>> [...]
>>>> > On Fedora 27 with 7.3.1 it gives
>>>> > ```
>>>> > stod ("nan") = nan
>>>> > stod ("-nan") = nan
>>>> > quiet_NaN () = nan
>>>> > ```
[...]
>> Cygwin 2.10.0 64 bit with gcc 7.3.0
>> ```
>> strtod ("nan", NULL) = -nan
>> strtod ("-nan", NULL) = nan
>> nan ("") = nan
>> ```
>> 
>> Ubuntu 16.04 LTS 64 bit with gcc 5.4.0
>> ```
>> strtod ("nan", NULL) = nan
>> strtod ("-nan", NULL) = nan
>> nan ("") = nan
>> ```

I've created the quick hack patch that fixes `strtod ()`.

On Cygwin 64 bit with the patch, result of foobar.c:

```
strtod ("nan", NULL) = nan
strtod ("-nan", NULL) = nan
nan ("") = nan
```

Also result of foobar.cc:

```
stod ("nan") = nan
stod ("-nan") = nan
quiet_NaN () = nan
```
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