only include watch_main_loop for simulator builds

apps/starter-project/app.c

@@ -1,7 +1,6 @@
 #include <stdio.h>
 #include <string.h>
 #include "watch.h"
-#include "watch_main_loop.h"
 
 //////////////////////////////////////////////////////////////////////////////////////////
 // This section sets up types and storage for our application state.

watch-library/shared/watch/watch.h

@@ -30,6 +30,10 @@
 #include "driver_init.h"
 #include "pins.h"
 
+#ifdef __EMSCRIPTEN__
+#include "watch_main_loop.h"
+#endif // __EMSCRIPTEN__
+
 /** @mainpage Sensor Watch Documentation
  *  @brief This documentation covers most of the functions you will use to interact with the Sensor Watch
            hardware. It is divided into the following sections: