[Bug libstdc++/96269] optional comparison with nullopt fails

[ville.voutilainen at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96269

--- Comment #5 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Oh, and if you define a spaceship operator for your type, then things work
again, with or without FLIP.