fix code layout build

Author: 3nids

.ci/travis/code_layout/script.sh

@@ -16,7 +16,9 @@ set -e
 
 pushd build
 
+export CTEST_BUILD_DIR=${TRAVIS_BUILD_DIR}
 export CTEST_BUILD_COMMAND="/usr/bin/make -j3 -i -k"
+
 python3 ${TRAVIS_BUILD_DIR}/.ci/travis/scripts/ctest2travis.py xvfb-run ctest -V --output-on-failure -S ${TRAVIS_BUILD_DIR}/.ci/travis/travis.ctest
 
 ctest -V -R PyQgsDocCoverage