Image: remove efficient state field

jme3-core/src/main/java/com/jme3/texture/Image.java

@@ -367,7 +367,6 @@ public class Image extends NativeObject implements Savable /*, Cloneable*/ {
     protected int width, height, depth;
     protected int[] mipMapSizes;
     protected ArrayList<ByteBuffer> data;
-    protected transient Object efficientData;
     protected int multiSamples = 1;
     protected ColorSpace colorSpace = null;
 //    protected int mipOffset = 0;
@@ -761,8 +760,6 @@ public class Image extends NativeObject implements Savable /*, Cloneable*/ {
      */
     @Deprecated
     public void setEfficentData(Object efficientData){
-        this.efficientData = efficientData;
-        setUpdateNeeded();
     }
 
     /**
@@ -770,7 +767,7 @@ public class Image extends NativeObject implements Savable /*, Cloneable*/ {
      */
     @Deprecated
     public Object getEfficentData(){
-        return efficientData;
+        return null;
     }
 
     /**