Reduce externs

src/normal.c

@@ -5,6 +5,7 @@
 #include "task.h"
 #include "trig.h"
 #include "constants/rgb.h"
+#include "flying.h"
 
 void AnimConfusionDuck(struct Sprite *);
 void AnimSimplePaletteBlend(struct Sprite *);
@@ -36,8 +37,6 @@ static void sub_81162F8(u8);
 static void sub_81163D0(struct Sprite *);
 static void sub_81165E4(struct Sprite *);
 
-extern void sub_810E2C8(struct Sprite *);
-
 const union AnimCmd gUnknown_0859722C[] =
 {
     ANIMCMD_FRAME(0, 8),