Pass by ref in localeconv to avoid copying, since Windows doesn't seem to like that

Author: ldionne

libcxx/include/__locale_dir/locale_base_api.h

@@ -54,7 +54,7 @@ size_t __libcpp_mbsnrtowcs_l(wchar_t* dest, const char** src, size_t max_out, si
 size_t __libcpp_mbrtowc_l(wchar_t* dest, cosnt char* src, size_t count, mbstate_t*, locale_t);
 int __libcpp_mbtowc_l(wchar_t* dest, const char* src, size_t count, locale_t);
 size_t __libcpp_mbrlen_l(const char* str, size_t count, mbstate_t*, locale_t);
-lconv* __libcpp_localeconv_l(locale_t);
+lconv* __libcpp_localeconv_l(locale_t&);
 size_t __libcpp_mbsrtowcs_l(wchar_t* dest, const char** src, size_t len, mbstate_t*, locale_t);
 int __libcpp_snprintf_l(char* dest, size_t buff_size, locale_t, const char* format, ...);
 int __libcpp_asprintf_l(char** dest, locale_t, const char* format, ...);

libcxx/include/__locale_dir/locale_base_api/bsd_locale_defaults.h

@@ -73,7 +73,7 @@ inline _LIBCPP_HIDE_FROM_ABI size_t __libcpp_mbrlen_l(const char* __s, size_t __
 }
 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-inline _LIBCPP_HIDE_FROM_ABI lconv* __libcpp_localeconv_l(locale_t __loc) { return ::localeconv_l(__loc); }
+inline _LIBCPP_HIDE_FROM_ABI lconv* __libcpp_localeconv_l(locale_t& __loc) { return ::localeconv_l(__loc); }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 inline _LIBCPP_HIDE_FROM_ABI size_t

libcxx/include/__locale_dir/locale_base_api/bsd_locale_fallbacks.h

@@ -80,7 +80,7 @@ inline _LIBCPP_HIDE_FROM_ABI size_t __libcpp_mbrlen_l(const char* __s, size_t __
 }
 #endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-inline _LIBCPP_HIDE_FROM_ABI lconv* __libcpp_localeconv_l(locale_t __l) {
+inline _LIBCPP_HIDE_FROM_ABI lconv* __libcpp_localeconv_l(locale_t& __l) {
   __locale_guard __current(__l);
   return localeconv();
 }