message: Fix cmake < v3.7 compatibility in Cuda.cmake
  Fix for compatibility with CMake <3.7 (related conversation under 37e4289)
  * Fix cmake < v3.7 compatibility in Cuda.cmake
  * Fix version test variable naming in Cuda.cmake
diff: @@ -109,8 +109,8 @@ function(caffe_select_nvcc_arch_flags out_variable)
  set(__nvcc_flags "")
  set(__nvcc_archs_readable "")
  - string(COMPARE GREATER_EQUAL "${CUDA_VERSION}" "9.0" iscudanewerthan90)
  - if(iscudanewerthan90)
  + string(COMPARE LESS "${CUDA_VERSION}" "9.0" iscudaolderthan90)
  + if(NOT iscudaolderthan90)
  string(REPLACE "21(20)" "" __cuda_arch_bin "${__cuda_arch_bin}")
  string(REPLACE "20" "" __cuda_arch_bin "${__cuda_arch_bin}")
  endif()
  