message: correct introduced issue
diff: # stt_conn_tool
  add_executable(sst_conn_tool ./sst_conn_tool.c)
  +target_link_libraries(sst_conn_tool adios2)
  if(ADIOS2_HAVE_MPI)
  - target_link_libraries(sst_conn_tool adios2 MPI::MPI_C)
  + target_link_libraries(sst_conn_tool MPI::MPI_C)
  endif()
  if(WIN32)
  