[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 #5 from Janez Zemva <janezz55 at gmail dot com> ---
Thank you for the "fix", I am writing my own 128-bit integral type, but in the
mean time, I'm using __int128.