Allow -g3 for CUDA v3.0+.

In versions of the CUDA toolkit previous to version 3.0 the use of -g3 would cause
compilation errors.  This was fixed in version 3.0.

Modules/FindCUDA.cmake

@@ -941,8 +941,8 @@ macro(CUDA_WRAP_SRCS cuda_target format generated_files)
     # we convert the strings to lists (like we want).
 
     if(CUDA_PROPAGATE_HOST_FLAGS)
-      # nvcc chokes on -g3, so replace it with -g
-      if(CMAKE_COMPILER_IS_GNUCC)
+      # nvcc chokes on -g3 in versions previous to 3.0, so replace it with -g
+      if(CMAKE_COMPILER_IS_GNUCC AND CUDA_VERSION VERSION_LESS "3.0")
         string(REPLACE "-g3" "-g" _cuda_C_FLAGS "${CMAKE_${CUDA_C_OR_CXX}_FLAGS_${config_upper}}")
       else()
         set(_cuda_C_FLAGS "${CMAKE_${CUDA_C_OR_CXX}_FLAGS_${config_upper}}")