Have helloworld sample exit immediately using sysapp

samples/helloworld/Makefile

@@ -18,7 +18,7 @@ BUILD    := build
 SOURCE   := src
 INCLUDE  := include
 DATA     := data
-LIBS     := -lcoreinit -lproc_ui
+LIBS     := -lcoreinit -lproc_ui -lsysapp
 
 CFLAGS   += -O2 -Wall -std=c11
 CXXFLAGS += -O2 -Wall

samples/helloworld/src/main.c

@@ -3,6 +3,7 @@
 #include <coreinit/thread.h>
 #include <coreinit/foreground.h>
 #include <proc_ui/procui.h>
+#include <sysapp/launch.h>
 
 bool isAppRunning = true;
 
@@ -82,6 +83,10 @@ main(int argc, char **argv)
    OSReport("Core 0 thread returned %d", resultCore0);
    OSReport("Core 2 thread returned %d", resultCore2);
    
+   // Sends messages for ProcUI to release foreground, exit
+   // and launch into the system menu immediately.
+   SYSLaunchMenu();
+   
    while(AppRunning());
    return 0;
 }