Revert "Clean up build warning"

This reverts commit 17a173ebb5.

(cherry picked from commit d269975784)

core/src/validator.rs

@@ -1430,9 +1430,15 @@ fn report_target_features() {
         not(target_os = "macos")
     ))]
     {
+        unsafe { check_avx() };
+    }
+}
+
 // Validator binaries built on a machine with AVX support will generate invalid opcodes
 // when run on machines without AVX causing a non-obvious process abort.  Instead detect
 // the mismatch and error cleanly.
+#[target_feature(enable = "avx")]
+unsafe fn check_avx() {
     if is_x86_feature_detected!("avx") {
         info!("AVX detected");
     } else {
@@ -1442,7 +1448,6 @@ fn report_target_features() {
         abort();
     }
 }
-}
 
 // Get the activated stake percentage (based on the provided bank) that is visible in gossip
 fn get_stake_percent_in_gossip(bank: &Bank, cluster_info: &ClusterInfo, log: bool) -> u64 {