Submodules must be pulled.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/build-in-docker.sh

@@ -2,6 +2,7 @@
 
 source tests/docker_env.sh
 #run_in_docker rm -rf CMakeFiles
+run_in_docker git submodule update --recursive
 run_in_docker mkdir -p build_in_docker
 run_in_docker -w "$PWD/build_in_docker" cmake -DENABLE_EMULATION=1 ..
 run_in_docker -w "$PWD/build_in_docker" make -j ${NUM_PROC}