[Patch,fortran] PR 27740 Symbol versioning for libgfortran

[FX Coudert]

> I'm not a big fan of undocumented options.  People have a way of
> finding and using these options.  I'd rather document the option
> with something like
>
> -fallow-leading-underscore -- This option is intended for internal
>     use by the gfortran developers.  IT IS SUBJECT TO GO AWAY WITHOUT
>     WARNING.

Attached patch was tested with make info and make html.

FX

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