Support xfail in harness tests
Support xfail in harness tests

see https://github.com/liblouis/liblouis/issues/84

IndexBraille/liblouis,hammera/liblouis,vsmontalvao/liblouis,liblouis/liblouis,BueVest/liblouis,IndexBraille/liblouis,vsmontalvao/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,BueVest/liblouis,IndexBraille/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis,IndexBraille/liblouis,IndexBraille/liblouis,vsmontalvao/liblouis,vsmontalvao/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,vsmontalvao/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,liblouis/liblouis