[SYCL][CUDA] Add missing macro to interop-backend-traits.cpp

[JackAKirk]

This test generally uses traits of different backends when compiling using the default spirv triple. It seems this means that the test manually defines some macros that are usually defined by the backend. For the ext_oneapi_cuda case a macro was missing leading to the test failure. I have added this missing required macro.

Fixes this post-commit windows failure: https://github.com/intel/llvm/actions/runs/3585225542/jobs/6032932018

Signed-off-by: JackAKirk [email protected]

[pvchupin]

• SYCL :: UserDefinedReductions/user_defined_reductions.cpp on HIP/CUDA to be addressed in [SYCL] Disable user defined reductions on CUDA/HIP llvm-test-suite#1429
• SYCL :: AtomicRef/max_local.cpp tracked at [SYCL][HIP] HIP backend timing out on max_local in CI #7604
• It's not clear what's caused

Unresolved Tests (5):
  SYCL :: Assert/assert_in_kernels.cpp
  SYCL :: Assert/assert_in_multiple_tus.cpp
  SYCL :: Assert/assert_in_multiple_tus_one_ndebug.cpp
  SYCL :: Assert/assert_in_one_kernel.cpp
  SYCL :: Assert/assert_in_simultaneously_multiple_tus_one_ndebug.cpp

I'll look into that.