Rollup merge of #103262 - andrewpollack:switch-needs-unwind, r=tmandry

Adjusting test to needs-unwind, with linking issue

Test requires `needs-unwind` (see linked issue #103261)

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

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