message: cmake: don't try to re-add existing lib
diff: @@ -17,7 +17,9 @@ else()
  endif()
  if (TINYXML2_FOUND)
  + if(NOT TARGET tinyxml2::tinyxml2)
  add_library(tinyxml2::tinyxml2 INTERFACE IMPORTED)
  + endif()
  set_target_properties(tinyxml2::tinyxml2 PROPERTIES
  INTERFACE_INCLUDE_DIRECTORIES "${TINYXML2_INCLUDE_DIR}"
  INTERFACE_LINK_LIBRARIES "${TINYXML2_LIBRARY}")
  