message: CUDA backend: disable streams temporarily
diff: #include "common.cuh"
  /// Should the implementation use streams to schedule kernels in parallel if possible?
  -#define ENOKI_CUDA_USE_STREAMS 1
  +#define ENOKI_CUDA_USE_STREAMS 0
  /// Synchronize with the device after each kernel launch (useful for debugging)
  #define ENOKI_CUDA_LAUNCH_BLOCKING 0
  