Adjusting test to needs-unwind, with linking issue

Author: andrewpollack

src/test/ui/test-attrs/test-fn-signature-verification-for-explicit-return-type.rs

@@ -1,5 +1,5 @@
 // run-pass
-// ignore-fuchsia Test must be run out-of-process
+// needs-unwind (#73509)
 
 #![feature(test)]