strtod, strtold: Use the locale's decimal point. * lib/strtod.c: Include <locale.h>, <stdio.h>, <langinfo.h>. (decimal_point_char): New function, copied from lib/vasnprintf.c. (parse_number): Add a radixchar argument. Use it instead of '.'. (STRTOD): Invoke decimal_point_char and pass the result to parse_number. * m4/strtod.m4 (gl_PREREQ_STRTOD): Test whether nl_langinfo exists. * m4/strtold.m4 (gl_PREREQ_STRTOLD): Likewise. * tests/test-strtod1.c: New file. * tests/test-strtod1.sh: New file. * modules/strtod-tests (Files): Add test-strtod1.{sh,c}. Add locale-fr.m4 and its dependencies. (configure.ac): Invoke gt_LOCALE_FR, gt_LOCALE_FR_UTF8. (Makefile.am): Arrange to compile test-strtod1.c and run test-strtod1.sh. * tests/test-strtold1.c: New file. * tests/test-strtold1.sh: New file. * modules/strtold-tests (Files): Add test-strtold1.{sh,c}. Add locale-fr.m4 and its dependencies. (configure.ac): Invoke gt_LOCALE_FR, gt_LOCALE_FR_UTF8. (Makefile.am): Arrange to compile test-strtold1.c and run test-strtold1.sh.

#include <config.h>
#define STATAT_INLINE _GL_EXTERN_INLINE
#include "openat.h"