[PR c++/82710] false positive paren warning

[Nathan Sidwell]

This patch fixes pr82710, were we erroneously warn on something like:
    friend class_X (::other::name (...));
the parens are needed, otherwise the '::other' is taken to be a 
qualified lookup inside the class_X.

Unfortunately, at the point we can check, we've lost information that 
'::' was used.  So I back off when we see a qualified name there.

nathan
-- 
Nathan Sidwell
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