[Bug libstdc++/95915] [10/11 Regression] std::variant doesn't like types with a defaulted virtual destructor

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95915

--- Comment #1 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Patch at https://gcc.gnu.org/pipermail/gcc-patches/2020-June/549030.html