(struct frame): Define members font_driver_list and font_data_list
unconditionally.
struct terminal;
-#ifdef USE_FONT_BACKEND
struct font_driver_list;
-#endif /* USE_FONT_BACKEND */
struct frame
{
}
output_data;
-#ifdef USE_FONT_BACKEND
/* List of font-drivers available on the frame. */
struct font_driver_list *font_driver_list;
/* List of data specific to font-driver and frame, but common to
faces. */
struct font_data_list *font_data_list;
-#endif /* USE_FONT_BACKEND */
/* Total width of fringes reserved for drawing truncation bitmaps,
continuation bitmaps and alike. The width is in canonical char