temporarily disabling the initilization of the Root Cint error callback. It expects...

temporarily disabling the initilization of the Root Cint error callback. It expects a void*,
but the callback is of course a function*. On some systems, the warning is interpreted as
error. Have to check whether the definition of the fuction in Root needs to be changed to
void (*)() as argument, or whether there is another workaround.