message: Fix compatibility issue with CMake 3.10
  target_link_libraries/INTERFACE doesn't seem to work on CMake 3.10, but
  directly setting the property does work.
  Fixes
diff: @@ -7,5 +7,6 @@ include("${CMAKE_CURRENT_LIST_DIR}/pugixml-targets.cmake")
  # for compatibility.
  if (NOT DEFINED PACKAGE_FIND_VERSION OR PACKAGE_FIND_VERSION VERSION_LESS "1.11")
  add_library(pugixml INTERFACE IMPORTED)
  - target_link_libraries(pugixml INTERFACE pugixml::pugixml)
  + # Equivalent to target_link_libraries INTERFACE, but compatible with CMake 3.10
  + set_target_properties(pugixml PROPERTIES INTERFACE_LINK_LIBRARIES pugixml::pugixml)
  endif ()
  