Removed movbe from run-time-detect

`movbe` seems to not be a run-time detectable feature on x86.
It has thus been removed from the list.
It was only commented out to ease comparison against the full list.

library/std/tests/run-time-detect.rs

@@ -86,7 +86,7 @@ fn x86_all() {
     println!("fma: {:?}", is_x86_feature_detected!("fma"));
     println!("fxsr: {:?}", is_x86_feature_detected!("fxsr"));
     println!("lzcnt: {:?}", is_x86_feature_detected!("lzcnt"));
-    println!("movbe: {:?}", is_x86_feature_detected!("movbe"));
+    //println!("movbe: {:?}", is_x86_feature_detected!("movbe")); // movbe is unsupported as a target feature
     println!("pclmulqdq: {:?}", is_x86_feature_detected!("pclmulqdq"));
     println!("popcnt: {:?}", is_x86_feature_detected!("popcnt"));
     println!("rdrand: {:?}", is_x86_feature_detected!("rdrand"));