[Bug c/117548] ICE when redeclaring function with a compatible type involving C23 structure compatibility

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117548

--- Comment #2 from uecker at gcc dot gnu.org ---
Created attachment 59599
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59599&action=edit
patch

Tentative patch.