That was a bad case of premature optimization.
Multiplication is indeed faster, but when working with floats this can introduce some rather unexpected inaccuracies.
Like x/x suddenly no longer being 1.0 (something guaranteed by division).
If someone really needs this back, then please add some new function which makes it clear we don't just have a typical division here.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6298 dfc29bdd-3216-0410-991c-e03cc46cb475
GLES drivers adapted, but only did make compile-tests.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475