Bundled md5 in OCaml

[Richard W.M. Jones]

See:
https://github.com/ocaml/ocaml/blob/trunk/byterun/md5.c#L78

(1) In terms of the bundled(md5-$IMPLEMENTATION), which
$IMPLEMENTATION is this?

(2) Ideally I would like to replace this with a call to a library (in
Fedora, I don't think this would be accepted upstream).  But which
library should I use?

Rich.

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