Added binwalk package, and its dependency pyqtgraph.
Added runtime dependencies for binwalk.
Merge pull request #4203 from k0ral/binwalk

Added binwalk package, and its dependency pyqtgraph.
ocaml-cairo: fix sha256

Seems that the original sha was just wrong but because Hydra doesn't
build this and we appear to have had no OCaml users until very recently,
no one noticed.
ocaml-cairo: inherit platforms
Fix Ocaml version for MonotoneViz so that lablgtk woks