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

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58876
Bug 58876 depends on bug 61600, which changed state.

Bug 61600 Summary: #pragma GCC diagnostic pop  leaves warnings enabled
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61600

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE