Don't allow nonstd::string view to use std::string_view when in C++ 17 mode
Don't allow nonstd::string view to use std::string_view when in C++ 17 mode

turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo,turol/smaaDemo