rand_jitter: Fix deprecated code

We no longer support Rust < 1.24.

Author: vks

rand_jitter/src/lib.rs

@@ -83,9 +83,6 @@ pub use crate::error::TimerError;
 use core::{fmt, mem, ptr};
 #[cfg(feature = "std")]
 use std::sync::atomic::{AtomicUsize, Ordering};
-#[cfg(feature = "std")]
-#[allow(deprecated)]  // Required for compatibility with Rust < 1.24.
-use std::sync::atomic::ATOMIC_USIZE_INIT;
 
 const MEMORY_BLOCKS: usize = 64;
 const MEMORY_BLOCKSIZE: usize = 32;
@@ -180,8 +177,7 @@ impl Clone for JitterRng {
 
 // Initialise to zero; must be positive
 #[cfg(all(feature = "std", not(target_arch = "wasm32")))]
-#[allow(deprecated)]
-static JITTER_ROUNDS: AtomicUsize = ATOMIC_USIZE_INIT;
+static JITTER_ROUNDS: AtomicUsize = AtomicUsize::new(0);
 
 impl JitterRng {
     /// Create a new `JitterRng`. Makes use of `std::time` for a timer, or a