Files
ardour/libs/pbd/pbd
Robin Gareus defc902571 Allow to use Destructible as virtual base class
This is in preparation for a pure-virtual base class for
PluginInsert to expose `DropReferences` in the virtual base.

```
class PlugInsertBase : virtual public PBD::Destructible
class PluginInsert : public Processor, public PlugInsertBase
class Processor : public SessionObject
class SessionObject : public PBD::StatefulDestructible
```
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