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

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

* dispextern.h (scratch_glyph_row, window_box_edges):
(glyph_to_pixel_coords, set_cursor_from_row):
(get_next_display_element, set_iterator_to_next):
(highlight_trailing_whitespace, frame_to_window_pixel_xy):
(show_mouse_face): Remove decls
* frame.h (message_buf_print): Likewise.
* lisp.h (pop_message, set_message, check_point_in_composition):
Likewise.
* xterm.h (set_vertical_scroll_bar): Likewise.
* xdisp.c (list_of_error, Vmessage_stack, line_number_displayed):
(message_buf_print, scratch_glyph_row, displayed_buffer):
(set_iterator_to_next, pop_message, set_message, set_cursor_from_row):
(get_next_display_element, show_mouse_face, window_box_edges):
(frame_to_window_pixel_xy, check_point_in_composition):
(set_vertical_scroll_bar, highlight_trailing_whitespace): Now static.
(glyph_to_pixel_coords): Remove; unused.