r23024: Ok, neither the duplicates_allowed nor the timeout argument to

r23024: Ok, neither the duplicates_allowed nor the timeout argument to
message_send_pid is used anymore. Two users of duplicates_allowed: winbind and
the printer notify system.

I don't thing this really changes semantics: duplicates_allowed is hell racy
anyway, we can't guarantee that we don't send the same message in sequence
twice, and I think the only thing we can harm with the print notify is
performance.

For winbind I talked to Günther, and he did not seem too worried.

Volker
(This used to be commit 75b3ae6a761c33ae6a70799340a1e8c1edea265e)