asrc_flite: do not crash on multiple instances.
The voice register functions return the same voice structure upon multiple registration. It causes us two problems: If we delete a voice without deregistering it, it leaves a dangling pointer inside the library. If we delete or unregister a voice at uninit, it may still be in use by another instance of the filter. The second problem is solved by keeping an usage counter inside asrc_flite. This is not thread-safe, but neither is flite itself.
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