[Bug c++/128428] strip_typedefs logic not great for installed system headers

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128428

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #3)
> For trunk, I always get the former even when compiling with system headers.
> That changed with r17-451
> 
> Author:     Jason Merrill 
> AuthorDate: Mon May 11 16:55:06 2026
> 
>     c-family: look through non-user-facing typedef [PR124621]

The summary of PR124621 is "FAIL:
g++.dg/reflect/reflect_constant_(array|string)2.C" so this just seems like an
exact dup of that bug.