[Bug fortran/46496] Missing strlen check / interop warnings with BIND(C) and non-C_* kinds

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46496

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
b) -Wno-c-binding-type silences the warnings related to C binding.

It remains in this PR the missed warnings in d) and e).