Merge #1122

1122: testsuite/rust: fix test case failure on macOS r=CohenArthur a=liushuyu

- extent `macro_return` xfail targets to three-segment triples

Co-authored-by: liushuyu <liushuyu011@gmail.com>

gcc/testsuite/rust/compile/xfail/macro_return.rs

@@ -1,4 +1,4 @@
-// { dg-excess-errors "...." { xfail *-*-*-* } }
+// { dg-excess-errors "...." { xfail *-*-*-* *-*-* } }
 
 macro_rules! add {
     ($a:expr) => { $a };