[Bug fortran/95631] Unable to redefine a literal with `-std=legacy'

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95631

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Well we decided long time ago not to support that extension.
See PR 37974 and maybe even some g77 bug reports.