Remove dead sub references

gflib/sprite.h

@@ -281,7 +281,6 @@ void FreeSpriteTiles(struct Sprite *sprite);
 void FreeSpritePalette(struct Sprite *sprite);
 void FreeSpriteOamMatrix(struct Sprite *sprite);
 void DestroySpriteAndFreeResources(struct Sprite *sprite);
-void sub_800142C(u32 a1, u32 a2, u16 *a3, u16 a4, u32 a5);
 void AnimateSprite(struct Sprite *sprite);
 void SetSpriteMatrixAnchor(struct Sprite* sprite, s16 x, s16 y);
 void StartSpriteAnim(struct Sprite *sprite, u8 animNum);