Replace forEach with Count

Use count where you do not need _forEachIndex variable, it's quicker
than forEach.

SQF/dayz_code/compile/player_alertZombies.sqf

@@ -27,4 +27,4 @@ if ("ItemMap_Debug" in items player) then {
 	} else {
 		_zombie setVariable ["myDest",_pos,true];
 	};
-} forEach _listTalk;
+} count _listTalk;