VS: Restore support for CUDA with no optimization flags
Since commit 67de5b7b82 (VS: Suppress MSBuild default settings affected
by UseDebugLibraries, 2024-02-13, v3.30.0-rc1~538^2~1) we generate an
empty `Optimization` element for the host compiler when there are no C
or C++ optimization flags enabled. The CUDA Toolkit Visual Studio
integration fails with an error if an empty string is inherited from the
host compiler's `Optimization` element. If no CUDA optimization flags
are specified, write an explicit empty `Optimization` element for the
CUDA compiler too.
Fixes: #26144
1 file changed
