Do not call exit() when app put to background, we'll recreate GL textures from SDL (not done yet!)

project/jni/sdl_main/sdl_main.c

@@ -46,6 +46,7 @@ JAVA_EXPORT_NAME(DemoRenderer_nativeInit) ( JNIEnv*  env, jobject thiz )
 	chdir(curdir);
 	setenv("HOME", curdir, 1);
 
+	__android_log_print(ANDROID_LOG_INFO, "libSDL", "Calling SDL_main()" );
 	main( argc, argv );
 };