cmake Cg examples

OrfeasZ/ZHMModSDK External/RakNet/CmakeIncludes/Ogre3D/FindOGRE.cmake :229 

find_package(Cg QUIET)

qwertzui11/voxelTerrain cmake/Modules/FindOGRE.cmake :262 

find_package(Cg QUIET)

punesemu/puNES CMakeLists.txt :102 

find_package(Cg REQUIRED)