[Bug objc/108743] -fconstant-cfstrings not supported

[ossman at cendio dot se via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108743

--- Comment #5 from Pierre Ossman <ossman at cendio dot se> ---
Could you consider adding -fconstant-cfstrings as an alias? It would make life
easier for making build systems compiler agnostic.