c_locale.cc (__convert_to_v): Use _GLIBCXX_HAVE_STRTOF instead _GLIBCXX_USE_C99 to check for strtof.


	* config/locale/generic/c_locale.cc (__convert_to_v): Use
	_GLIBCXX_HAVE_STRTOF instead _GLIBCXX_USE_C99 to check for strtof.
	Likewise, use _GLIBCXX_HAVE_STRTOLD instead of _GLIBCXX_USE_C99
	to check for presence of strtold.

From-SVN: r88472