XFAIL : tst_QScriptEngine::newQObject() FIXME: newly created QObject's prototype is an JS Object

The QObject prototype object should itself be a QObject (i.e. wrapping a null pointer) and have methods valueOf and toString.
I don't know if anyone really relies on this; it's for consistency with the ECMA classes (The Number prototype is a number, the Array prototype is an array, etc).