Use const for a string pointer.

* src/dispnew.c (add_window_display_history): Use const for the string
pointer.  Remove declaration, not needed.

src/ChangeLog

+2011-05-31  Dan Nicolaescu  <dann@ics.uci.edu>
+
+	* dispnew.c (add_window_display_history): Use const for the string
+	pointer.  Remove declaration, not needed.
+
 2011-05-31  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Use 'inline', not 'INLINE'.

src/dispnew.c

@@ -290,7 +290,6 @@ static int history_idx;
 static unsigned history_tick;
 
 static void add_frame_display_history (struct frame *, int);
-static void add_window_display_history (struct window *, char *, int);
 
 /* Add to the redisplay history how window W has been displayed.
    MSG is a trace containing the information how W's glyph matrix
@@ -298,7 +297,7 @@ static void add_window_display_history (struct window *, char *, int);
    has been interrupted for pending input.  */
 
 static void
-add_window_display_history (struct window *w, char *msg, int paused_p)
+add_window_display_history (struct window *w, const char *msg, int paused_p)
 {
   char *buf;
 
@@ -6235,9 +6234,6 @@ init_display (void)
     }
 
   if (!inhibit_window_system && display_arg
-#ifndef CANNOT_DUMP
-     && initialized
-#endif
      )
     {
       Vinitial_window_system = Qx;