FindCUDAToolkit: Avoid error when nvcc is found without the whole toolkit

Since commit 507b641639 (FindCUDAToolkit: Add cufilt target for CUDA
11.4 and above, 2026-05-27, v4.4.0-rc1~62^2) we try to construct an
imported target for `cufilt` whenever `nvcc` is found even if the
toolkit is not found.  Fix conditions to avoid that.

Modules/FindCUDAToolkit.cmake

@@ -1560,6 +1560,10 @@ if(CUDAToolkit_FOUND)
 
   _CUDAToolkit_find_and_add_import_lib(OpenCL)
 
+  if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 11.4)
+    _CUDAToolkit_find_and_add_import_lib(cufilt)
+  endif()
+
   find_program(CUDA_bin2c_EXECUTABLE
     NAMES bin2c
     HINTS ${CUDAToolkit_BIN_DIR}
@@ -1591,10 +1595,6 @@ if(CUDAToolkit_FOUND)
   endif()
 endif()
 
-if(CUDAToolkit_VERSION VERSION_GREATER_EQUAL 11.4)
-  _CUDAToolkit_find_and_add_import_lib(cufilt)
-endif()
-
 if(_CUDAToolkit_Pop_ROOT_PATH)
   list(REMOVE_AT CMAKE_FIND_ROOT_PATH 0)
   unset(_CUDAToolkit_Pop_ROOT_PATH)