A few more traveler fixes

graphics/traveler/Kconfig

@@ -8,6 +8,7 @@ if GRAPHICS_TRAVELER
 config GRAPHICS_TRAVELER_PERFMON
 	bool "Performance monitor game"
 	default y
+	depends on NX && FS_READABLE && !NX_LCDDRIVER
 	---help---
 		Enable or disable performance monitoring instrumentation and output.
 

graphics/traveler/src/trv_main.c

@@ -149,7 +149,11 @@ static double trv_current_time(void)
  * Description:
  ****************************************************************************/
 
-int main(int argc, char *argv[])
+#ifdef CONFIG_BUILD_KERNEL
+int main(int argc, FAR char *argv[])
+#else
+int traveler_main(int argc, char *argv[])
+#endif
 {
   FAR struct trv_graphics_info_s ginfo;
   struct trv_framebuffer_s frame;