Enable TranslateMessage again for external Windows. Something Strong99 requested in an old forum post (http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=44918&p=257786) 


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4742 dfc29bdd-3216-0410-991c-e03cc46cb475