Added a workaround for Android GL glitches when pausing the app

modules/juce_core/native/java/JuceAppActivity.java

@@ -220,6 +220,13 @@ public class JuceAppActivity   extends Activity
     protected void onPause()
     {
         suspendApp();
+
+        try
+        {
+            Thread.sleep (1000); // This is a bit of a hack to avoid some hard-to-track-down
+                                 // openGL glitches when pausing/resuming apps..
+        } catch (InterruptedException e) {}
+
         super.onPause();
     }