[Libguestfs] [PATCH libguestfs 1/2] ocaml/implicit_close test: collect all currently unreachable blocks

[Richard W.M. Jones]

This bug and thread seem relevant:

https://github.com/ocaml/ocaml/issues/11812
https://discuss.ocaml.org/t/ocaml-5-gc-releasing-memory-back-to-the-os/11293

Rich.

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