update to new libgdx api

vtm-gdx/src/org/oscim/gdx/GdxMap.java

@@ -606,6 +606,11 @@ public abstract class GdxMap implements ApplicationListener {
 			return true;
 		}
 
+		@Override
+        public boolean panStop(float x, float y, int pointer, int button) {
+	        return false;
+        }
+
 	}
 
 }