WHIZARD crashes upon finalization if compile is executed twice.

[kilian]

If there is a second (explicit or implicit) compile commmand because the process library is first loaded and later extended and loaded again, the program crashes when a process finalizer is called.

This occurs only at the very end, and the finalizers are no-ops anyway (currently), so we may as well remove them. But it indicates a problem with the dlopen mechanism.