[Bug libstdc++/112997] _Unwind_Exception conflicts with void*. failed to build with clang

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112997

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think we can just change the declaration in unwind-cxx.h