Start implementing LG and 1.1

src/main.c

@@ -57,8 +57,10 @@ static void IntrDummy(void);
 
 #if defined(FIRERED)
 #define GAME_VERSION VERSION_FIRE_RED
-#elif defined(LEAF_GREEN)
+#elif defined(LEAFGREEN)
 #define GAME_VERSION VERSION_LEAF_GREEN
+#else
+#error unknown version
 #endif
 const u8 gGameVersion = GAME_VERSION;