* xfns.c: Make symbols static if they're not exported.

* xfns.c: Make symbols static if they're not exported.

(x_last_font_name, x_display_info_for_name):
(x_set_foreground_color, x_set_background_color, x_set_mouse_color):
(x_set_cursor_color, x_set_border_pixel, x_set_border_color):
(x_set_cursor_type, x_set_icon_type, x_set_icon_name):
(x_set_scroll_bar_foreground, x_set_scroll_bar_background):
(x_explicitly_set_name, x_set_title, xic_defaut_fontset, tip_timer):
(last_show_tip_args): Now static.
(xic_defaut_fontset, xic_create_fontsetname): Define only if
defined HAVE_X_WINDOWS && defined USE_X_TOOLKIT
(x_screen_planes): Remove; unused.
* dispextern.h (x_screen_planes): Remove decl.