Android: create Pause/ResumeSem semaphore at higher level than CreateWindow()

- If you call onPause() before CreateWindow(), SDLThread will run in infinite loop in background.

- If you call onPause() between a DestroyWindow() and a new CreateWindow(), semaphores are invalids.

SDLActivity.java: the first resume() starts the SDLThread, don't call
nativeResume() as it would post ResumeSem. And the first pause would
automatically be resumed.

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -505,10 +505,14 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
                     mSDLThread = new Thread(new SDLMain(), "SDLThread");
                     mSurface.enableSensor(Sensor.TYPE_ACCELEROMETER, true);
                     mSDLThread.start();
+                    
+                    // No nativeResume(), don't signal Android_ResumeSem
+                    mSurface.handleResume();
+                } else {
+                    nativeResume();
+                    mSurface.handleResume();
                 }
 
-                nativeResume();
-                mSurface.handleResume();
                 mCurrentNativeState = mNextNativeState;
             }
         }