Support >INT_MAX -C dirs

* src/extract.c (struct delayed_set_stat, struct delayed_link):
* src/misc.c (normalize_filename, wd_count, chdir_count)
(chdir_arg, tar_getcdpath):
* src/names.c (name_gather, addname, add_hierarchy_to_namelist):
* src/unlink.c (struct deferred_unlink, flush_deferred_unlinks):
Use idx_t, not int, for directory indexes, so as to not
limit their number to INT_MAX; this is theoretically possible
if -T is used.
* src/names.c (name_next_elt, name_next):
Use bool for boolean.

src/extract.c

@@ -115,7 +115,7 @@ struct delayed_set_stat
     bool after_links;
 
     /* Directory that the name is relative to.  */
-    int change_dir;
+    idx_t change_dir;
 
     /* extended attributes*/
     char *cntx_name;
@@ -165,7 +165,7 @@ struct delayed_link
     struct timespec mtime;
 
     /* The directory that the sources and target are relative to.  */
-    int change_dir;
+    idx_t change_dir;
 
     /* A list of sources for this link.  The sources are all to be
        hard-linked together.  */
@@ -1850,7 +1850,7 @@ extract_archive (void)
      (see NOTICE in the comment to delay_set_stat above) */
   if (!delay_directory_restore_option)
     {
-      int dir = chdir_current;
+      idx_t dir = chdir_current;
       apply_nonancestor_delayed_set_stat (current_stat_info.file_name, false);
       chdir_do (dir);
     }