Fix lazy initialisation bug for parametizability (#2046)

remove lazy and compute prefix at compile time

substrate/srml/support/src/lib.rs

@@ -64,21 +64,6 @@ pub use runtime_io::print;
 #[doc(inline)]
 pub use srml_support_procedural::decl_storage;
 
-pub mod lazy {
-	use spin::Once;
-
-	pub struct Lazy<T: Sync>(Once<T>);
-
-	impl <T: Sync> Lazy<T> {
-		pub const INIT: Self = Lazy(Once::INIT);
-
-		#[inline(always)]
-		pub fn get<F>(&'static self, builder: F) -> &T where F: FnOnce() -> T {
-			self.0.call_once(builder)
-		}
-	}
-}
-
 #[macro_export]
 macro_rules! fail {
 	( $y:expr ) => {{