updated c++ sdl example.
updated c++ sdl example.

rusthon/Rusthon,secureosv/pythia,rusthon/Rusthon,rusthon/Rusthon,secureosv/pythia,secureosv/pythia,rusthon/Rusthon,secureosv/pythia,pombredanne/Rusthon,secureosv/pythia,pombredanne/Rusthon,pombredanne/Rusthon,pombredanne/Rusthon,rusthon/Rusthon,pombredanne/Rusthon