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Since OCaml 5.1.1, changes to custom blocks caused C finalizers that
call caml_enter_blocking_section to stop working (if they ever did
before). They are relatively inflexible compared to registering an
OCaml finalizer (Gc.finalise) to call Guestfs.close, so use that
instead.
Suggested-by: Guillaume Munch-Maccagnoni
See: https://github.com/ocaml/ocaml/issues/12820
See: db48794fa8