Silence a warning about an unused macro due to #[cfg(...)]

src/simd.rs

@@ -258,6 +258,7 @@ macro_rules! impl_load {
     }}
 }
 
+#[allow(unused_macros)]
 macro_rules! simd_load_fallback {
     ($ty:ty, $vec_ty:ty, $self:ident) => {{
         let mut a = core::mem::MaybeUninit::uninit_array();