Fix: Remove check_cxx_symbol_exists() for more portable check_symbol_exists()
Fix: Remove check_cxx_symbol_exists() for more portable check_symbol_exists()

hpcc-systems/cpp-driver,hpcc-systems/cpp-driver,hpcc-systems/cpp-driver,mikefero/cpp-driver,mikefero/cpp-driver,datastax/cpp-driver,datastax/cpp-driver,datastax/cpp-driver,mikefero/cpp-driver,hpcc-systems/cpp-driver,mikefero/cpp-driver,datastax/cpp-driver,mikefero/cpp-driver