Re: new module 'strtold'

[Bruno Haible]

> That looks good to me, thanks.

OK. I verified that the of symbols used by c-strtod.o and c-strtold.o on
several platforms is as expected:

                 nm c-strtod.o                nm c-strtold.o
                 BEFORE       AFTER           BEFORE       AFTER

glibc-2.24       strtod_l     strtod_l        strtold_l    strtold_l

glibc-2.3.2      strtod_l     rpl_strtod      strtold_l    rpl_strtold
                              uselocale                    uselocale

Mac OS X 10.5    strtod_l     rpl_strtod      strtold_l    rpl_strtold
                              uselocale                    uselocale

Solaris 11.4     strtod       rpl_strtod      strtold      strtold
                 setlocale    uselocale       setlocale    uselocale

So I pushed the change.

Note: It looks odd that on Solaris 11.4, configure determines that strtold
works but strtod is buggy. But this is in fact right: Indeed, the string
"0XaP+1" is parsed correctly by strtold, but not by strtod.

Bruno