Delete X11 conditionals.

Delete X11 conditionals.
(XTupdate_end, XTupdate_begin, XTclear_end_of_line)
(XTclear_frame, XRINGBELL, stufflines, scraplines, dumprectangle)
(XTread_socket, x_draw_box, clear_cursor, refreshicon, x_iconify_frame)
(x_bitmap_icon, x_text_icon, x_new_font, x_term_init)
(x_calc_absolute_position, x_set_window_size)
(x_make_frame_visible, x_make_frame_invisible): Delete X10 code.
(dumpqueue, x_do_pending_expose, dumpborder, XEvent, x_read_exposes)
(enqueue_event, dequeue_event, queue_event_count)
(mouse_event_pending_p, x_set_resize_hint): Delete X10 versions.