message: fixed issue with circular header check
diff: if (GINKGO_CHECK_CIRCULAR_DEPS)
  add_library(ginkgo_public_api INTERFACE) # dummy target
  + target_link_libraries(ginkgo_public_api INTERFACE hwloc)
  set_property(TARGET ginkgo_public_api APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_SOURCE_DIR}")
  set_property(TARGET ginkgo_public_api APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_BINARY_DIR}")
  ginkgo_check_headers(ginkgo_public_api "")
  