Change GameFuture.complete() to protected visibility

Author: tomcashman

CHANGES

@@ -1,3 +1,6 @@
+[1.8.6]
+- Change GameFuture.complete() to protected visibility
+
 [1.8.5]
 - Add methods to clear interactive and non-interactive script queues
 

core/src/main/java/org/mini2Dx/miniscript/core/GameFuture.java

@@ -105,8 +105,10 @@ void evaluate(float delta) {
 		}
 	}
 
-	private void complete() {
-		completed.set(true);
+	protected void complete() {
+		if(completed.getAndSet(true)) {
+			return;
+		}
 		synchronized (this) {
 			notifyAll();
 		}