Unregister a global callback function, previously registered using RegisterGlobalCallback.
备注
It is only legal to call this function from inside the plug-in registration global callback, exclusively when receiving AkGlobalCallbackLocation::AkGlobalCallbackLocation_Term. This function should not be called from inside the plug-in instance (e.g. in Init, Execute, etc.) to prevent deadlocks when processing plug-ins in parallel. It is illegal to call this function while already inside of a registered global callback. This function might stall for several milliseconds before returning.