message: ci: Disable unreliable tests on windows
diff: # accompanying file Copyright.txt for details.
  #------------------------------------------------------------------------------#
  +if(ADIOS2_HAVE_MPI AND NOT WIN32) # Doesn't reliably work on windows
  gtest_add_tests_helper(ManyVars ${test_mpi} "" Performance. "")
  -if(ADIOS2_HAVE_MPI AND NOT WIN32) # Doesn't reliably work on windows
  # Pure C code, not added to test,
  # just for executing manually for performance studies
  add_executable(PerfManyVars PerfManyVars.c)
  