libutil: Add a stacked, recursive directory tree iterator

The concept is simple: Use the existing, platform dependent iterator
to walk a directory. If a directory entry is encountered, recurse into
it using the open_subdir handler, reconstruct the full path for any
entries discovered using the directory stack.

An additional function is added to skip a sub-hierarchy.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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