cmake VEXCL_HAVE_CUDA examples

KratosMultiphysics/Kratos external_libraries/vexcl/examples/CMakeLists.txt :78 

target_compile_definitions(fft_benchmark ${LIB_TYPE} VEXCL_HAVE_CUDA)

ddemidov/vexcl examples/CMakeLists.txt :78 

target_compile_definitions(fft_benchmark ${LIB_TYPE} VEXCL_HAVE_CUDA)