hashtable: Avoid use of std::unary_function
It is removed by C++17. It only defines some typedef members for derived functionals. We don't use those, so just drop it.
We are implementing enhanced network protection measures. During connection checks, you may briefly see a “verifying connection” screen. This is a normal part of our security process and requires no action.
It is removed by C++17. It only defines some typedef members for derived functionals. We don't use those, so just drop it.