Optimized and avoids problems on Phosh shell
Thanks @TheBrokenRail for a patch (was a tiny part of patch #322).
https://sourceforge.net/p/irrlicht/patches/322
Changed patch slighlty to unify with rest of Irrlicht code.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6174 dfc29bdd-3216-0410-991c-e03cc46cb475