hashtable: Drop when building inside CMake
CMake now builds as C++11 or higher and uses unordered_{map,set}
instead of hash_{map,set}
. Skip providing KWSys hashtable to it
since it uses features deprecated by C++17.
CMake now builds as C++11 or higher and uses unordered_{map,set}
instead of hash_{map,set}
. Skip providing KWSys hashtable to it
since it uses features deprecated by C++17.