AKU.cpp: removed call to AKUFinalize on exit.

This was crashing somewhere because of a failed assertion, but it was really
hard to debug the exact reasons for it.
In any case, there is no need to clear out that memory since the process
is going away.
Merge pull request #53 from mindsnacks/feature/removed-AKU-on-exit

AKU.cpp: removed call to AKUFinalize on exit.