Merge pull request #6691 from pchote/objective-duplication

Fix closure issue with mission objectives.

OpenRA.Mods.RA/Widgets/Logic/Ingame/GameInfoObjectivesLogic.cs

@@ -53,8 +53,9 @@ namespace OpenRA.Mods.RA.Widgets.Logic
 		{
 			parent.RemoveChildren();
 
-			foreach (var objective in mo.Objectives.OrderBy(o => o.Type))
+			foreach (var o in mo.Objectives.OrderBy(o => o.Type))
 			{
+				var objective = o; // Work around the loop closure issue in older versions of C#
 				var widget = template.Clone();
 
 				var label = widget.Get<LabelWidget>("OBJECTIVE_TYPE");