Fix warnings in test suite.
Disable XML reader check which was marked as still open.
Most tests don't go through, due to wrong image size (probably from changes in Win32 device, which now takes a larger render size than actually used).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3360 dfc29bdd-3216-0410-991c-e03cc46cb475