Reduce externs

src/battle_main.c

@@ -57,6 +57,7 @@
 #include "constants/songs.h"
 #include "constants/species.h"
 #include "constants/trainers.h"
+#include "cable_club.h"
 
 extern struct MusicPlayerInfo gMPlayInfo_SE1;
 extern struct MusicPlayerInfo gMPlayInfo_SE2;
@@ -69,9 +70,6 @@ extern const u8 *const gBattlescriptsForRunningByItem[];
 extern const u8 *const gBattlescriptsForUsingItem[];
 extern const u8 *const gBattlescriptsForSafariActions[];
 
-// functions
-extern void sub_80B3AF8(u8 taskId); // cable club
-
 // this file's functions
 static void CB2_InitBattleInternal(void);
 static void CB2_PreInitMultiBattle(void);