re PR libstdc++/31836 (FAIL: 27_io/basic_istream/extractors_arithmetic/char/12.cc execution test)

	PR libstdc++/31836
	* config/locale/generic/c_locale.cc (__convert_to_v): Don't use
	strtold if _GLIBCXX_HAVE_BROKEN_STRTOLD is defined.
	* config/os/hpux/os_defines.h (_GLIBCXX_HAVE_BROKEN_STRTOLD): Define
	if __hppa__ is defined.

From-SVN: r126914