Libretro: Minor cleanups and fixes.

MIDlets can close themselves without much of a problem in the
libretro rendition, so no need for that MIDlet conditional anymore.

Also use SIGSTOP for pausing, as it cannot be ignored.

src/javax/microedition/midlet/MIDlet.java

@@ -60,7 +60,7 @@ public static void initAppProperties(HashMap<String, String> initProperties)
 	public final void notifyDestroyed()
 	{ 
 		Mobile.log(Mobile.LOG_INFO, MIDlet.class.getPackage().getName() + "." + MIDlet.class.getSimpleName() + ": " + "MIDlet sent Destroyed Notification");
-		if(!Mobile.getPlatform().isLibretro) { System.exit(0); }
+		System.exit(0);
 	}
 
 	public final void notifyPaused() { }

src/libretro/freej2me_libretro.c

@@ -673,7 +673,7 @@ void pauseFreeJ2ME(bool pause)
 {
 #ifdef __linux__
 	// NOTE: Despite being a "kill" function, it really just sends a signal to stop and continue the process here 
-	if(pause) { kill(javaProcess, SIGTSTP); }
+	if(pause) { kill(javaProcess, SIGSTOP); }
 	else { kill(javaProcess, SIGCONT); }
 #elif _WIN32
 	// NOTE: Untested, tries to suspend/resume java app's main thread.

src/org/recompile/freej2me/Libretro.java

@@ -141,13 +141,11 @@ public Libretro(String args[])
 	private class LibretroIO
 	{
 		private Timer keytimer;
-		private TimerTask keytask;
 
 		public void start()
 		{
 			keytimer = new Timer();
-			keytask = new LibretroTimerTask();
-			keytimer.schedule(keytask, 0, 1);
+			keytimer.schedule(new LibretroTimerTask(), 0, 1);
 		}
 
 		private class LibretroTimerTask extends TimerTask