fileNameASCIIPrefix got deprecated but is used in core
The function fileNameASCIIPrefix in class.tslib_fe.php is deprecated with the message "please use the "simulatestatic" sysext directly"
problem is that this function is also called in other parts of the core. for example if a menu is built with using gifbuilder and config.meaningfulTempFilePrefix is enabled.
see class.tslib_gifbuilder.php #14462
(issue imported from #M12604)