cmake CXX_HAS_AVX2 examples

UPBGE/upbge intern/cycles/CMakeLists.txt :94 

check_cxx_compiler_flag(-mavx2 CXX_HAS_AVX2)

UPBGE/upbge intern/cycles/CMakeLists.txt :105 

check_cxx_compiler_flag(/QxCORE-AVX2 CXX_HAS_AVX2)

UPBGE/upbge intern/cycles/CMakeLists.txt :116 

check_cxx_compiler_flag(-xcore-avx2 CXX_HAS_AVX2)