[Bug libgcc/96948] _Unwind_GetIP() and _Unwind_GetIPInfo() empty in _Unwind_Backtrace() with SEH on mingw64

[krlmlr+gcc at mailbox dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96948

--- Comment #1 from Kirill Müller <krlmlr+gcc at mailbox dot org> ---
Created attachment 49188
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49188&action=edit
Proposed patch