Attempt to fix cpu-detection test

Author: Amanieu

crates/std_detect/tests/cpu-detection.rs

@@ -1,17 +1,8 @@
-#![feature(
-    stdarch_internal,
-    stdarch_arm_feature_detection,
-    stdarch_powerpc_feature_detection
-)]
+#![feature(stdarch_internal)]
+#![cfg_attr(target_arch = "arm", feature(stdarch_arm_feature_detection))]
+#![cfg_attr(target_arch = "powerpc", feature(stdarch_powerpc_feature_detection))]
+#![cfg_attr(target_arch = "powerpc64", feature(stdarch_powerpc_feature_detection))]
 #![allow(clippy::unwrap_used, clippy::use_debug, clippy::print_stdout)]
-#![cfg(any(
-    target_arch = "arm",
-    target_arch = "aarch64",
-    target_arch = "x86",
-    target_arch = "x86_64",
-    target_arch = "powerpc",
-    target_arch = "powerpc64"
-))]
 
 #[macro_use]
 extern crate std_detect;

examples/connect5.rs

@@ -28,7 +28,9 @@
 //! You should see a game self-playing. In the end of the game, it shows the average time for
 //! each move.
 
-#![feature(avx512_target_feature, stdarch_x86_avx512)]
+#![feature(avx512_target_feature)]
+#![cfg_attr(target_arch = "x86", feature(stdarch_x86_avx512))]
+#![cfg_attr(target_arch = "x86_64", feature(stdarch_x86_avx512))]
 #![feature(stmt_expr_attributes)]
 
 use rand::seq::SliceRandom;