Fix packaging issues

Carla.uplugin

@@ -10,9 +10,9 @@
 	"DocsURL": "",
 	"MarketplaceURL": "",
 	"SupportURL": "",
-	"CanContainContent": true,
+	"CanContainContent": false,
 	"IsBetaVersion": true,
-	"Installed": false,
+	"Installed": true,
 	"Modules": [
 		{
 			"Name": "Carla",

Source/Carla/Carla.Build.cs

@@ -49,6 +49,12 @@ public class Carla : ModuleRules
     AddBoostDependency(Target);
     AddProtobufDependency(Target);
     AddCarlaServerDependency(Target);
+
+    if (Target.Platform == UnrealTargetPlatform.Linux)
+    {
+      // Fails to link the std libraries.
+      PublicAdditionalLibraries.Add("stdc++");
+    }
   }
 
   private bool IsWindows(TargetInfo Target)