octave: add arpack, libwebp, and darwin compat
octave: add arpack, libwebp, and darwin compat

This follows on from PR #16965 for qrupdate and PR #16968 for fltk.

WIth these, the added explicit dependencies on arpack (to support
the octave `eigs` function) and `libwebp`, and not pulling X11 things,
octave works properly on darwin.

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