[Bug c/108295] Free label positions shouldn't be available outside -std=c2x

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108295

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
"When a base standard is specified, the compiler accepts all programs following
that standard plus those using GNU extensions that do not contradict it."

Wrong again.
https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/C-Dialect-Options.html#index-std-1