windows/utility: Add default io completion routine

source/windows/utility.hpp

@@ -50,6 +50,13 @@ namespace datapath {
 				return converter.from_bytes(string);
 			}
 
+			static VOID CALLBACK def_io_completion_routine(_In_ DWORD dwErrorCode,
+				_In_ DWORD dwNumberOfBytesTransfered,
+				_Inout_ LPOVERLAPPED lpOverlapped)
+			{
+
+			}
+
 		} // namespace utility
 	}         // namespace windows
 } // namespace datapath