Change 22200

C. Thomas Tyler
More elegant and portable implementation of logic to find config file
in same dir as mkdirs.sh script.  Works on Mac, too.

This works for various means of calling mkdirs.sh, e.g.
./mkdirs.sh
/full/path/to/mkdirs.sh
/path/with/symlink/to/mkdirs.sh
mkdirs.sh (found in PATH)

Approving my own review here for this minor change so I can deploy, as others are on holiday or traveling.
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