Make libstdc++ use strtold on MinGW

[NightStrike]

On 2/28/08, Joseph S. Myers <joseph@codesourcery.com> wrote:
> libstdc++ has code (in config/locale/generic/c_locale.cc) that uses
> strtold to convert strings to long double if available, falling back
> to scanf %Lf if strtold is not available.  MinGW has strtold - but
> does not have working scanf %Lf (Kai Tietz's patch correctly records
> this format as unavailable on Windows).  Thus it's important for


How does this affect the patch that Kai is working on?