Tests: Teach CudaOnly.CUBIN to tolerate toolkit not supporting native arch

Since commit 2def6a874b (CUDA: Add support for CUBIN, FATBIN, and
OPTIXIR compilation, 2023-01-27) added this test, it has failed when
executed with a CUDA toolkit that does not support the true native
architecture of the GPU.  Detect this case and skip the test.

Tests/CudaOnly/CUBIN/CMakeLists.txt

@@ -1,9 +1,17 @@
 cmake_minimum_required(VERSION 3.18)
+unset(ENV{CMAKE_CUDA_ARCHITECTURES_NATIVE_CLAMP}) # CUBIN needs true native arch
 project(CudaCUBIN LANGUAGES CUDA)
 
-
 set(CMAKE_CUDA_ARCHITECTURES all-major)
 
+# CUBIN needs the true native arch to be supported by the CUDA toolkit.
+set(unavailable_native_archs "${CMAKE_CUDA_ARCHITECTURES_NATIVE}")
+list(REMOVE_ITEM unavailable_native_archs ${CMAKE_CUDA_ARCHITECTURES_ALL})
+if(unavailable_native_archs)
+  add_executable(CudaOnlyCUBIN main_no_native_archs.cu)
+  return()
+endif()
+
 add_library(CudaCUBIN OBJECT kernelA.cu kernelB.cu kernelC.cu)
 set_property(TARGET CudaCUBIN PROPERTY CUDA_CUBIN_COMPILATION ON)
 set_property(TARGET CudaCUBIN PROPERTY CUDA_ARCHITECTURES native)

Tests/CudaOnly/CUBIN/main_no_native_archs.cu

@@ -0,0 +1,4 @@
+int main()
+{
+  return 0;
+}