Fix for GCC headers complaining about string_view header if string_theory was compiled for C++17 but the client is compiled for an older standard.
Fix for GCC headers complaining about string_view header if string_theory
was compiled for C++17 but the client is compiled for an older standard.

zrax/string_theory,zrax/string_theory,zrax/string_theory,zrax/string_theory