Added framework option for compiling under OSX with Makefile. Suggested by blues2008. Please note that default is still using X11, you need to disable the X11 linking and enable the framework line. Also make sure to use the proper device and config settings.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3053 dfc29bdd-3216-0410-991c-e03cc46cb475