Fixed linking issues on iOS platform.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4690 dfc29bdd-3216-0410-991c-e03cc46cb475
Minor comments improvements.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4691 dfc29bdd-3216-0410-991c-e03cc46cb475