Patch for Friend function linkage check (PR 15841)

[Rafael Espíndola]

> Linkage specifications don't actually have members under the standard.
> Instead, they just set the language linkage of any non-class-member name
> declared therein that has external linkage.  That would seem to apply to
> a friend declaration.

I see, it is just a difference on how the standard is written and how
clang is implemented. Is something like the attached patch what we
need?

> John.

Cheers,
Rafael
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