Fix unsupported targets

Author: gnzlbg

crates/std_detect/src/detect/os/linux/mod.rs

@@ -17,7 +17,7 @@ cfg_if! {
         mod powerpc;
         pub use self::powerpc::check_for;
     } else {
-        use arch::detect::Feature;
+        use crate::detect::Feature;
         /// Performs run-time feature detection.
         pub fn check_for(_x: Feature) -> bool {
             false