fix build with Boost > 1.70

Author: pkohout

third_party/third_party.cmake

@@ -13,6 +13,7 @@ else()
   set(SPDLOG_BUILD_SHARED ON)
 #  FetchContent_MakeAvailable(spdlog)
 endif()
+find_package( Boost COMPONENTS system program_options filesystem thread REQUIRED )
 find_package(FreeOpcUa QUIET)
 if (FreeOpcUa_FOUND)
   message(STATUS "Found FreeOpcUa on system")
@@ -24,4 +25,5 @@ else()
 #    GIT_SHALLOW TRUE
 #  )
 #  FetchContent_MakeAvailable(FreeOpcUa)
+  message(STATUS "Found FreeOpcUa NOT on system")
 endif()