VST3 Factories with multiple instances produced by factories not supported

[sadko4u]

Original ticket: lsp-plugins/lsp-plugins#384

For windows (not depending, is it 32-bit or 64-bit), Carla does not instantiate the desired VST3 plugin in a bundle.
Instead of this, it instantiates the first plugin listed by the factory.

[atskler]

For Linux also.