Rather than using both -prune (which requires directory-first tree traversal) and -delete (which implies depth-first traversal), avoid using -delete in favour of -execdir.
Rather than using both -prune (which requires directory-first tree traversal)
and -delete (which implies depth-first traversal), avoid using -delete in
favour of -execdir.

This has a side-effect of not removing directories that contain files,
even if we delete all of those files, but IMHO that's a better option
than specifying all possible local filesystem types in this script.

PR:		122811
MFC after:	3 weeks

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