[patch, testsuite] Disable dw2-dir-file-name.exp on remote and/or Windows host

[Sandra Loosemore]

This is yet another testsuite fix to clean up results on remote Windows 
host.

For this testcase, I did consider trying to fix it rather than just 
disabling it for remote host, but it looked like it was going to be an 
awful lot of work and trial-and-error (it has almost no comments to 
explain what it is trying to test, or how it is getting there).  I think 
it is at least an incremental improvement to document that it isn't 
expected to work as-is on remote host.  And disabling it does get rid of 
33 completely bogus FAILs.  :-P

OK?

-Sandra
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