remove unnecessary(?) #[allow(const_err)]

Author: hkratz

src/implementation/algorithm.rs

@@ -182,7 +182,6 @@ macro_rules! algorithm_simd {
             #[cfg_attr(not(target_arch="aarch64"), target_feature(enable = $feat))]
             #[inline]
             #[allow(unconditional_panic)] // does not panic because len is checked
-            #[allow(const_err)] // the same, but for Rust 1.38.0
             unsafe fn check_block(&mut self, input: SimdInput) {
                 // WORKAROUND
                 // necessary because the for loop is not unrolled on ARM64