Cleanup externs in overworld.c

include/field_player_avatar.h

@@ -60,5 +60,8 @@ bool8 IsPlayerFacingSurfableFishableWater(void);
 bool8 IsPlayerSurfingNorth(void);
 void sub_808C228(u8 direction);
 u8 sub_808BCD0(void);
+void sub_808B578(void);
+u8 GetFRLGAvatarGraphicsIdByGender(u8);
+u8 GetRSAvatarGraphicsIdByGender(u8);
 
 #endif // GUARD_FIELD_PLAYER_AVATAR_H