Remove a few unused functions reported by callcatcher (#11658)

src/script/lua_api/l_inventory.h

@@ -111,8 +111,6 @@ class InvRef : public ModApiBase {
 	// Creates an InvRef and leaves it on top of stack
 	// Not callable from Lua; all references are created on the C side.
 	static void create(lua_State *L, const InventoryLocation &loc);
-	static void createPlayer(lua_State *L, RemotePlayer *player);
-	static void createNodeMeta(lua_State *L, v3s16 p);
 	static void Register(lua_State *L);
 };