* cygwin.din (__locale_mb_cur_max): Export.

	* cygwin.din (__locale_mb_cur_max): Export.
	* nlsfuncs.cc (__getlocaleinfo): Drop conversion to multibyte.
	(__charfromwchar): New function to convert to multibyte.
	(__eval_datetimefmt): Convert to return wchar_t pointer.  Work on
	wide char string.
	(__set_lc_time_from_win): Take additional pointer to "C" category info
	to accommodate C.foo locales.  Rework to fill wide char members in
	category info.
	(__set_lc_ctype_from_win): New function.
	(__set_lc_numeric_from_win): Take additional pointer to "C" category
	info to accommodate C.foo locales.  Rework to fill wide char members
	in category info.
	(__set_lc_monetary_from_win): Ditto.
	(__set_lc_messages_from_win): Ditto.
	(__get_current_collate_codeset): New function, called from nl_langinfo.
	* include/cygwin/config.h (__HAVE_LOCALE_INFO_EXTENDED__): Define.