<system_error>: explicitly pass the system locale ID for system_category messages (#2669)

Author: fsb4000

stl/src/syserror_import_lib.cpp

@@ -45,9 +45,15 @@ _NODISCARD size_t __CLRCALL_PURE_OR_STDCALL __std_system_error_allocate_message(
     // convert to name of Windows error, return 0 for failure, otherwise return number of chars in buffer
     // __std_system_error_deallocate_message should be called even if 0 is returned
     // pre: *_Ptr_str == nullptr
+    DWORD _Lang_id;
+    const int _Ret = GetLocaleInfoEx(LOCALE_NAME_SYSTEM_DEFAULT, LOCALE_ILANGUAGE | LOCALE_RETURN_NUMBER,
+        reinterpret_cast<LPWSTR>(&_Lang_id), sizeof(_Lang_id) / sizeof(wchar_t));
+    if (_Ret == 0) {
+        _Lang_id = 0;
+    }
     const unsigned long _Chars =
         FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
-            nullptr, _Message_id, 0, reinterpret_cast<char*>(_Ptr_str), 0, nullptr);
+            nullptr, _Message_id, _Lang_id, reinterpret_cast<char*>(_Ptr_str), 0, nullptr);
 
     return _CSTD __std_get_string_size_without_trailing_whitespace(*_Ptr_str, _Chars);
 }