Merged revision 4534-4578 from 1.8 branch:
- Fix crash in SoftwareDriver2 when Material was EMT_DETAIL_MAP but texture[1] was not set (Thanks for fix by chronologicaldot)
- Fix issue in CAnimatedMeshSceneNode::clone which cause crash. (reported and fixed by luthyr)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4579 dfc29bdd-3216-0410-991c-e03cc46cb475