FindCUDAToolkit: Fix stub library representation on reconfigure

Since commit 0744c02e24 (FindCUDAToolkit: targets pointing to stubs now
use IMPORTED_IMPLIB, 2023-07-24, v3.28.0-rc1~309^2) we recognize CUDA
stub libraries and represent them in a special way.  However, the logic
only works on the first configuration of a build tree when the libraries
are first found.  Once the results are cached, we incorrectly revert to
the non-stub representation.

Fix this by recognizing stub libraries based on their path instead.
1 file changed