Fix std_example on s390x

Author: bjorn3

example/std_example.rs

@@ -8,6 +8,9 @@
     unboxed_closures
 )]
 #![allow(internal_features)]
+// FIXME once abi_unsupported_vector_types is a hard error disable the foo test when the respective
+// target feature is not enabled.
+#![allow(abi_unsupported_vector_types)]
 
 #[cfg(target_arch = "x86_64")]
 use std::arch::x86_64::*;