Revert "Export Boost libs needed also by host program at linking stage"

This reverts commit cd50c23da9c9b1deffee88dc0dc7fdb4539d5722.

Author: robertodr

cmake/ConfigBoost.cmake

@@ -49,5 +49,3 @@ if(CMAKE_SYSTEM_NAME MATCHES "Linux")
    find_package(RT)
    list(APPEND Boost_LIBRARIES ${LIBRT_LIBRARIES})
 endif()
-list(APPEND EXTERNAL_BOOST_LIBS ${Boost_CHRONO_LIBRARY} ${Boost_SYSTEM_LIBRARY} ${Boost_TIMER_LIBRARY} ${LIBRT_LIBRARIES})
-file(WRITE ${EXTERNAL_PROJECT_INSTALL_PREFIX}/boost_libs.txt "${EXTERNAL_BOOST_LIBS}")