Remove extern crate std_detect

Author: Kobzol

library/std_detect/tests/cpu-detection.rs

@@ -14,21 +14,6 @@
 #![cfg_attr(target_arch = "s390x", feature(stdarch_s390x_feature_detection))]
 #![allow(clippy::unwrap_used, clippy::use_debug, clippy::print_stdout)]
 
-#[cfg_attr(
-    any(
-        target_arch = "arm",
-        target_arch = "aarch64",
-        target_arch = "arm64ec",
-        target_arch = "riscv32",
-        target_arch = "riscv64",
-        target_arch = "powerpc",
-        target_arch = "powerpc64",
-        target_arch = "s390x",
-    ),
-    macro_use
-)]
-extern crate std_detect;
-
 #[test]
 fn all() {
     for (f, e) in std_detect::detect::features() {