Add unstable nightly avx512_target_feature

Author: teor2345

crates/subspace-proof-of-time/src/lib.rs

@@ -1,6 +1,6 @@
 //! Proof of time implementation.
 
-#![cfg_attr(target_arch = "x86_64", feature(stdarch_x86_avx512))]
+#![cfg_attr(target_arch = "x86_64", feature(avx512_target_feature, stdarch_x86_avx512))]
 #![no_std]
 
 mod aes;