fix night build

Author: salman01zp

curve25519-dalek/src/lib.rs

@@ -10,7 +10,14 @@
 // - Henry de Valence <hdevalence@hdevalence.ca>
 
 #![no_std]
-#![cfg_attr(all(curve25519_dalek_backend = "simd", nightly), feature(stdsimd))]
+#![cfg_attr(
+    all(
+        curve25519_dalek_backend = "simd",
+        nightly,
+        any(target_arch = "x86", target_arch = "x86_64")
+    ),
+    feature(stdarch_x86_avx512)
+)]
 #![cfg_attr(
     all(curve25519_dalek_backend = "simd", nightly),
     feature(avx512_target_feature)