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make: fix GCC warnings

@@ -36,16 +36,16 @@
         char            *path;
         short           length;
 } pathcellt, *pathcellpt, patht;
 typedef patht           *pathpt;
 
-extern  void            add_dir_to_path(register char *path, register pathpt *pointer, register int position);
+extern  void            add_dir_to_path(const char *path, register pathpt *pointer, register int position);
 extern  void            flush_path_cache(void);
 extern  void            flush_vroot_cache(void);
-extern  char            *get_path_name(void);
+extern  const char      *get_path_name(void);
 extern  char            *get_vroot_path(register char **vroot, register char **path, register char **filename);
-extern  char            *get_vroot_name(void);
+extern  const char      *get_vroot_name(void);
 extern  int             open_vroot(char *path, int flags, int mode, pathpt vroot_path, pathpt vroot_vroot);
 extern  pathpt          parse_path_string(register char *string, register int remove_slash);
 extern  void            scan_path_first(void);
 extern  void            scan_vroot_first(void);
 extern  void            set_path_style(int style);