Make the check-spirv target work for projects embedding clspv
Make the check-spirv target work for projects embedding clspv

Projects that embed clspv and relocate the clspv binary in the build
output couldn't use the check-spirv target as clspv wasn't where
lit.py expected to find it.

Use a generator expression so the path is correct in all cases.

Signed-off-by: Kévin Petit <7be082ac62c87f3fb90b426eef925ff08291362b@free.fr>

google/clspv,google/clspv,google/clspv,google/clspv,google/clspv