No more once_cell

Fix system audio check that didn't work because the API returns ()

src/device_notification_client.rs

@@ -11,12 +11,6 @@ pub(crate) struct DeviceNotificationClient {
     pub(crate) callback: Box<dyn Fn(&windows::core::PCWSTR)>
 }
 
-impl Drop for DeviceNotificationClient {
-    fn drop(&mut self) {
-        println!("DNC drop");
-    }
-}
-
 impl IMMNotificationClient_Impl for DeviceNotificationClient {
     fn OnDeviceStateChanged(
         &self,
@@ -32,8 +26,6 @@ impl IMMNotificationClient_Impl for DeviceNotificationClient {
     }
 
     fn OnDeviceRemoved(&self, _pwstrdeviceid: &windows::core::PCWSTR) -> windows::core::Result<()> {
-        println!("OnDeviceRemoved");
-        // TODO: Remove device and all its sessions
         Ok(())
     }