[Bug libstdc++/58876] No non-virtual-dtor warning in std::unique_ptr

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58876

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
At some point Ian Taylor filed a Bugzilla about these issues, I think it's
still open. Not sure what we should do in this area...