Due the crappy issue of classes having to be unique,
we cannot even have classes with identical content,
otherwise the compiler or linker is free to merge them,
giving the same result and bugs as if we had only one class.
Besides redesigning the option code to handle this correctly
I see only the option of requiring any two classes to have
different names, but the list of requirements for
AVClasses is getting kind of unmanageable.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>