I think this is my fourth complete rewrite of the dir-creation

code. <whew!> This version handles all of the following edge cases:
  * Restoring explicit dirs with 000 permissions (star fails this test)
  * Restore of implicit or explicit dirs when umask=777
    (gtar and star both fail this test)
  * Restoring dir paths containing "." and ".." components
This version initially creates all dirs with permission 700 (ignoring
umask), then does a post-extract "fixup" pass to set the correct
permissions (which may or may not depend on umask, depending on the
restore flags and whether it's an explicit or implicit dir).
Permissions are restored depth-first so that permissions within
non-writable dirs can be correctly restored. (The depth-sorting does
correctly account for dirs with ".." components.)

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