Fix std_example on s390x

Author: bjorn3

example/std_example.rs

@@ -166,6 +166,9 @@ fn main() {
         enum Never {}
     }
 
+    // FIXME once abi_unsupported_vector_types is a hard error disable this test when the respective
+    // target feature is not enabled.
+    #[allow(abi_unsupported_vector_types)]
     foo(I64X2([0, 0]));
 
     transmute_wide_pointer();
@@ -207,6 +210,9 @@ fn rust_call_abi() {
 struct I64X2([i64; 2]);
 
 #[allow(improper_ctypes_definitions)]
+// FIXME once abi_unsupported_vector_types is a hard error disable this test when the respective
+// target feature is not enabled.
+#[allow(abi_unsupported_vector_types)]
 extern "C" fn foo(_a: I64X2) {}
 
 #[cfg(target_arch = "x86_64")]