Use now getAttributeAsStringW instead of getAttributeAsString.
Thanks @chronologicaldot for report and patch: https://irrlicht.sourceforge.io/forum/viewtopic.php?f=7&t=52821
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6358 dfc29bdd-3216-0410-991c-e03cc46cb475