Add Data:getFFIPointer. Similar to Data:getPointer but returns a cdata pointer directly (or nil if the FFI isn't available).

It should be preferred instead of Data:getPointer because the latter uses lightuserdata which can't store more all possible memory addresses on some new arm64 architectures, when LuaJIT is used.

src/modules/filesystem/wrap_FileData.cpp

@@ -66,7 +66,9 @@ static const luaL_Reg w_FileData_functions[] =
 
 extern "C" int luaopen_filedata(lua_State *L)
 {
-	return luax_register_type(L, &FileData::type, data::w_Data_functions, w_FileData_functions, nullptr);
+	int ret = luax_register_type(L, &FileData::type, data::w_Data_functions, w_FileData_functions, nullptr);
+	love::data::luax_rundatawrapper(L, FileData::type);
+	return ret;
 }
 
 } // filesystem