Add missing MLINK for arc4rand(9).  It is documented in random(9) and referenced by gbde(4).
Add missing MLINK for arc4rand(9).  It is documented in
random(9) and referenced by gbde(4).

PR: docs/51254
Submitted by: Simon L. Nielsen <simon@nitro.dk>
Approved and Reviewed by: des (mentor), re (bmah)

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