[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 #6 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Any chance of moving this warning out of -Wextra and re-considering adding it
there for GCC 10?