(change_file_mode): Perform the chmod even if the

(change_file_mode): Perform the chmod even if the
file mode permission bits are the same as those that should be set.
Omitting the chmod call would be alright with minimal 1003.1e DS17
ACLs, but eventually there will be other permissions in addition to
rwx.  E.g., add and delete for directories, and something analogous
to NT's take ownership permission.