OsX[AppleEvents]: try to avoid some crash by delaying the function which is called

by such events...

Fixes #292

src/game/boe.main.hpp

@@ -1,6 +1,10 @@
 
 #include <SFML/Graphics.hpp>
 
+#ifdef __APPLE__
+extern eMenuChoice menuChoice;
+extern short menuChoiceId;
+#endif
 int main(int argc, char* argv[]);
 void update_everything();
 void redraw_everything();