Move the following targets from bsd.pkg.mk to bsd.utils.mk:

	show-depends-dirs
	show-all-depends-dirs
	show-all-depends-dirs-excl

While we're here, reimplement them using the new pkg_paths and
depends-depth-first.awk scripts.  As a side effect, this speeds up
the execution of these targets by around 5-15% depending on the
complexity of the dependency graph.

NOTE: This *does* change the behavior of these targets slightly because
      the output is now newline-separated instead of space-separated,
      and the order of the output lines doesn't match the original
      targets because the dependency graph is now walked depth-first
      instead of breadth first.

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