message: Make sure boost target is always there, utils needs it now
diff: @@ -209,7 +209,6 @@ else()
  )
  endif()
  -if (HMIADAPTER STREQUAL "messagebroker")
  find_package(Boost 1.66.0 COMPONENTS system thread)
  set(BOOST_LIB_SOURCE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/boost_src)
  set(BOOST_LIBS_DIRECTORY ${3RD_PARTY_INSTALL_PREFIX}/lib)
  @@ -236,7 +235,8 @@ if (HMIADAPTER STREQUAL "messagebroker")
  set(BOOST_INCLUDE_DIR ${BOOST_ROOT_DIR}/Boost-prefix/src/Boost)
  set(BOOST_LIB_DIR ${BOOST_ROOT_DIR}/Boost-prefix/src/Boost/stage/lib/)
  - endif()
  +else()
  +add_custom_target(Boost) # empty target, Boost is already installed
  endif()
  add_custom_target(install-3rd_party
  