message: fix an issue with build script
diff: @@ -103,13 +103,13 @@ build_cpp(){
  print_line
  echo "Building CPP in ${BUILD_MODE} mode"
  print_line
  - mkdir ${BUILD_PATH}
  - pushd ${BUILD_PATH} || exit 1
  - export ARROW_HOME=${BUILD_PATH}/arrow/install
  if [ "${PYTHON_BUILD}" = "ON" ]; then
  - read_python_requirements
  source "${PYTHON_ENV_PATH}"/bin/activate || exit 1
  + read_python_requirements
  fi
  + mkdir ${BUILD_PATH}
  + pushd ${BUILD_PATH} || exit 1
  + export ARROW_HOME=${BUILD_PATH}/arrow/install
  cmake -DPYCYLON_BUILD=${PYTHON_BUILD} -DPYTHON_EXEC_PATH=${PYTHON_ENV_PATH} -DCMAKE_BUILD_TYPE=${BUILD_MODE} $INSTALL_CMD ${SOURCE_DIR} || exit 1
  make -j 4 || exit 1
  printf "ARROW HOME SET :%s \n" "${ARROW_HOME}"
  