Remove "If you have C++11 comment" in lesson 10, since we've required C++11 for a long time
Remove "If you have C++11 comment" in lesson 10, since we've required C++11 for a long time

ronen/Halide,psuriana/Halide,ronen/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide