[Bug c++/88136] -Wdeprecated-copy is draconian and shouldn't be in -Wall

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88136

--- Comment #7 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Innocent users are going to hit it: https://bugreports.qt.io/browse/QTBUG-75210