* lisp.h (Mouse_HLInfo): Move from here...

* lisp.h (Mouse_HLInfo): Move from here...
* dispextern.h (Mouse_HLInfo): ...to here and offload lisp.h.
(reset_mouse_highlight): New function.
* msdos.c (dos_set_window_size, IT_update_begin)
(internal_terminal_init):
* nsterm.m (ns_update_window_end, x_free_frame_resources)
(ns_initialize_display_info):
* w32console.c (initialize_w32_display):
* w32term.c (x_update_window_end, x_free_frame_resources)
(w32_initialize_display_info):
* xterm.c (x_update_window_end, x_free_frame_resources, x_term_init):
* window.c (Fdelete_other_windows_internal):
* xdisp.c (clear_mouse_face, cancel_mouse_face): Use it.
* termchar.h (toplevel):
* xterm.h (toplevel): Include dispextern.h.