[Bug libstdc++/95561] std::is_signed_v<__int128> is false

[janezz55 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95561

--- Comment #3 from Janez Zemva <janezz55 at gmail dot com> ---
BTW: std::is_integral_v<__int128> is also false. I'm not certain, whether this
is a bug, but reporting nonetheless.