[Bug preprocessor/45599] Remove all code applying to obsolete "#pragma once"

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45599

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|SUSPENDED                   |RESOLVED
         Resolution|---                         |INVALID

--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> I'd just go for RESOLVED INVALID. We don't want to remove the code that
> implements a supported feature.

OK, doing so.