6154 const-ify segment ops structures

@@ -95,12 +95,12 @@
         ulong_t pg_pnbase;      /* pn within segment of first protv element */
 } prpagev_t;
 
 size_t pagev_lim = 256 * 1024;  /* limit on number of pages in prpagev_t */
 
-extern struct seg_ops segdev_ops;       /* needs a header file */
-extern struct seg_ops segspt_shmops;    /* needs a header file */
+extern const struct seg_ops segdev_ops; /* needs a header file */
+extern const struct seg_ops segspt_shmops;      /* needs a header file */
 
 static  int     set_watched_page(proc_t *, caddr_t, caddr_t, ulong_t, ulong_t);
 static  void    clear_watched_page(proc_t *, caddr_t, caddr_t, ulong_t);
 
 /*