(x_set_background_color): Remove unused variable(s).

(x_set_background_color): Remove unused variable(s).
(x_set_border_pixel): Ditto.
(x_set_menu_bar_lines): Put local variable used only for
non-toolkit case in #ifdef/#endif.
(x_figure_window_size): Remove unused variable(s).
(x_figure_window_size, x_window, lookup_image,
xbm_read_bitmap_file_data, x_build_heuristic_mask, pbm_load,
png_load, jpeg_load, gif_load, x_create_tip_frame,
x_create_tip_frame, Fx_show_tip, x_set_border_pixel): Ditto.