Eliminate more externs

src/frontier_util.c

@@ -35,8 +35,7 @@
 #include "constants/moves.h"
 #include "constants/items.h"
 #include "constants/event_objects.h"
-
-extern u8 gSelectedOrderFromParty[];
+#include "party_menu.h"
 
 struct FrontierBrainMon
 {
@@ -48,8 +47,6 @@ struct FrontierBrainMon
     u16 moves[4];
 };
 
-extern void sub_81B8558(void);
-
 // This file's functions.
 static void sub_81A17A0(void);
 static void sub_81A1830(void);