Fix rtt test, which failed on systems without fbo support.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3502 dfc29bdd-3216-0410-991c-e03cc46cb475
Fix AA setup for OpenGL under windows, where the extension was missing and no error came up due to unsupported feature request. Now, the driver recognizes the missing support and properly sets AA to 0.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3491 dfc29bdd-3216-0410-991c-e03cc46cb475