[test] Skip exceptional_return_const_test on Fuchsia

Change-Id: Idc249e027d64095b1951684501fdd9ff4fd92b2c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/448340
Reviewed-by: Brian Quinlan <[email protected]>
Commit-Queue: Brian Quinlan <[email protected]>
Auto-Submit: Liam Appelbe <[email protected]>
Commit-Queue: Liam Appelbe <[email protected]>

Author: liamappelbe

tests/ffi/ffi.status

@@ -51,6 +51,7 @@ vmspecific_native_finalizer_isolate_groups_test: Skip # SpawnUri not available o
 
 [ $system == fuchsia ]
 async_void_function_callbacks_test/*: Skip # Test harness doesn't support multitest with Fuchsia
+exceptional_return_const_test/*: Skip # Test harness doesn't support multitest with Fuchsia
 ffi_induce_a_crash_test/*: Skip # Test harness doesn't support multitest with Fuchsia
 function_callbacks_leaf_test: SkipByDesign # Needs access to Dart executable
 function_callbacks_many_test/*: Skip # Test harness doesn't support multitest with Fuchsia