fix more unused attribute warnings

Author: gnzlbg

coresimd/x86/mod.rs

@@ -33,8 +33,7 @@ types! {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(stdsimd)]
-    /// # #![cfg_attr(dox, feature(mmx_target_feature))]
+    /// # #![feature(stdsimd, mmx_target_feature)]
     /// # #![cfg_attr(not(dox), no_std)]
     /// # #[cfg(not(dox))]
     /// # extern crate std as real_std;

coresimd/x86/rdrand.rs

@@ -1,3 +1,4 @@
+
 //! RDRAND and RDSEED instructions for returning random numbers from an Intel
 //! on-chip hardware random number generator which has been seeded by an
 //! on-chip entropy source.

crates/coresimd/src/lib.rs

@@ -31,6 +31,7 @@
 #![doc(test(attr(deny(warnings))),
        test(attr(allow(dead_code, deprecated, unused_variables,
                        unused_mut))))]
+#![allow(unused_attributes)] // FIXME: spurious warnings?
 
 #[cfg_attr(not(test), macro_use)]
 extern crate core as _core;