contrib/ci.inria.fr/job-1-check.sh: set --oversubscribe for mpiexec

contrib/ci.inria.fr/job-1-check.sh

@@ -76,6 +76,8 @@ fi
 
 export STARPU_TIMEOUT_ENV=1800
 export MPIEXEC_TIMEOUT=1800
+export MPIEXEC_ARGS="--oversubscribe"
+
 make
 #make check
 (make -k check || true) 2>&1 | tee  ../check_$$