Removed 'final' from the android java activity class.

examples/Demo/Builds/Android/src/com/juce/jucedemo/JuceDemo.java

@@ -55,7 +55,7 @@ import android.media.MediaScannerConnection;
 import android.media.MediaScannerConnection.MediaScannerConnectionClient;
 
 //==============================================================================
-public final class JuceDemo   extends Activity
+public class JuceDemo   extends Activity
 {
     //==============================================================================
     static

modules/juce_core/native/java/JuceAppActivity.java

@@ -55,7 +55,7 @@ import android.media.MediaScannerConnection;
 import android.media.MediaScannerConnection.MediaScannerConnectionClient;
 
 //==============================================================================
-public final class JuceAppActivity   extends Activity
+public class JuceAppActivity   extends Activity
 {
     //==============================================================================
     static