presence: fix warning conflicting prototype
> Warning: presence_dmq.c:38:5: warning: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C2x, conflicting with a subsequent definition [-Wdeprecated-non-prototype]
> int pres_dmq_send_all_presentities();
> ^
> presence_dmq.c:487:5: note: conflicting prototype is here
> int pres_dmq_send_all_presentities(dmq_node_t *dmq_node)
> ^
> 1 warning generated.
(cherry picked from commit 03e49d4e1d806f39ee6aadaedd183a6578108d96)