NanoVDB includes "assert.h" and makes use of "assert" in several places and since the compile pipeline for CUDA/OptiX kernels does not define "NDEBUG" for release builds, those debug checks were always added. This is not intended, so this patch disables "assert" for CUDA/OptiX by defining "NDEBUG" before including NanoVDB headers. This also fixes a warning about unknown pragmas in NanoVDB thrown by the CUDA compiler.