* lib/mkdir-p.c (make_dir_parents): Close a race condition that

* lib/mkdir-p.c (make_dir_parents): Close a race condition that
occurs when "mkdir -m foo" creates a setgid directory that is (1)
writeable to group or other and (2) is intended to have a special
mode bit that is set or cleared.  In such a case, the directory
should be neither group- nor other-writeable until the special
mode bits are right.