Update issue-16278.rs

Author: GuillaumeGomez

tests/ui/issues/issue-16278.rs

@@ -1,10 +1,12 @@
-//@ run-pass
-// ignore-tidy-cr
-
-// this file has some special \r\n endings (use xxd to see them)
-
+//@ run-pass
+//@ ignore-backends: gcc
+// ignore-tidy-cr
+
+// this file has some special \r\n endings (use xxd to see them)
+
 fn main() {assert_eq!(b"", b"\
-                                   ");
+                                   ");
 assert_eq!(b"\n", b"
-");
-}
+
+");
+}