remove useless failed expreiment SharedInitialiser

src/ext/sync.rs

@@ -5,6 +5,9 @@ use std::sync::atomic::AtomicBool;
 use std::mem::MaybeUninit;
 use std::cell::UnsafeCell;
 
+// This was a failure. Just use `tokio::sync::oneshot`...
+
+/*
 #[derive(Debug)]
 struct SharedInitialiser<T>
 {
@@ -95,3 +98,4 @@ impl<T> SharedInitRx<T>
 	Arc::strong_count(&self.0.data) == 2
     }
 }
+*/