[Bug c++/81327] cast to void* does not suppress -Wclass-memaccess

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81327

--- Comment #3 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
By the way, this doesn't just block building Qt, but also using it for
development, because all uses of QVector that end up default-constructing an
element will run into this.