This fixes a data race by deleting the sound exactly when it finishes
playing.
Previously, a data race could happen in
`CleanupFinishedDuplicateSounds`, where the sound would be destroyed
while Aulib was reading from its buffer.
This option completely disables all audio handling, including audio
loading code and dependencies.
Dialog text length is estimated to be somewhere between
Cain and Griswold speed.
Anders Jenbo
Gleb Mazovetskiy