Readded samples CMakeLists with support for pong.c
Readded samples CMakeLists with support for pong.c

JohnRThomas/opengl-examples,runewake2/opengl-examples,JohnRThomas/opengl-examples,JohnRThomas/opengl-examples,runewake2/opengl-examples,runewake2/opengl-examples,runewake2/opengl-examples,JohnRThomas/opengl-examples