[Bug target/42159] unwinding issues on darwin

[ossman at cendio dot se]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42159

--- Comment #33 from Pierre Ossman <ossman at cendio dot se> ---
Created attachment 35198
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35198&action=edit
Remove unwinder on OS X