isl_test.c: directly include required header
isl_test.c: directly include required header

Do so instead of relying on this header getting included indirectly.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

nicolasvasilache/isl,PollyLabs/isl,evaautomation/isl,KangDroidSMProject/ISL,UBERTC/isl,simbuerg/isl,Distrotech/isl,simbuerg/isl,BenzoSM/isl,Distrotech/isl,simbuerg/isl,KangDroidSMProject/ISL,nicolasvasilache/isl,nicolasvasilache/isl,BenzoSM/isl,UBERTC/isl,abduld/isl,nicolasvasilache/isl,Meinersbur/isl,Meinersbur/isl,Distrotech/isl,PollyLabs/isl,nicolasvasilache/isl,abduld/isl,UBERTC/isl,tobig/isl,Distrotech/isl,tobig/isl,abduld/isl,simbuerg/isl,KangDroidSMProject/ISL,BenzoSM/isl,evaautomation/isl,UBERTC/isl,tobig/isl,inducer/isl-mirror,BenzoSM/isl,Meinersbur/isl,tobig/isl,inducer/isl-mirror,evaautomation/isl,inducer/isl-mirror,KangDroidSMProject/ISL,evaautomation/isl,inducer/isl-mirror,PollyLabs/isl,abduld/isl,simbuerg/isl,inducer/isl-mirror,Meinersbur/isl,KangDroidSMProject/ISL,BenzoSM/isl,PollyLabs/isl,PollyLabs/isl,Distrotech/isl