[Bug driver/13071] no easy way to exclude backward C++ headers from include path

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=13071

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #11)
> I'll open an LWG issue to get clarification.

LWG agrees that it's ill-formed (no diagnostic required) to include standard
headers inside a linkage-specification.

Libstdc++ tries to makes it work as QoI, e.g. r12-4367-gc1b6c360fcf3fc

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