Failing build following libffi upgrade

[Stephan Bergmann]

On 10/15/23 16:40, Julien Nabet wrote:
> now Python part fails to build with: Failed to build these modules: 
> _ctypes" but only with warnings. As if libffi and Python were now take 
> into account werror whereas it wasn't the case before.
> 

Did you maybe get confused by -Wimplicit-function-declaration now being 
diagnosed as an error instead of a warning for Clang since 
<https://github.com/llvm/llvm-project/commit/7d644e1215b376ec5e915df9ea2eeb56e2d94626> 
"[C11/C2x] Change the behavior of the implicit function declaration 
warning"?