message: skip validation on Windows
diff: @@ -176,6 +176,8 @@ set_property(TEST Utils.C.Writer.Bpls.ldvarI16.Dump
  PROPERTY DEPENDS Utils.C.Writer
  )
  +if(ADIOS2_HAVE_MPI)
  +
  add_test(NAME Utils.C.Writer.Bpls.ldvarI16.Validate
  COMMAND ${DIFF_EXECUTABLE} -u
  ${CMAKE_CURRENT_SOURCE_DIR}/TestUtilsCWriter.bplsldvarI16.expected.txt
  @@ -186,5 +188,6 @@ set_property(TEST Utils.C.Writer.Bpls.ldvarI16.Validate
  )
  +endif(ADIOS2_HAVE_MPI)
  