Suggested patch for cygwin perl 5.10

[Eliot Moss]

Sorry I got it backwards; thanks for the tip, and for
looking into it. Yes, I am sure Cwd is tricky to get right!
The first change is cygwin-specific, so might be less
controversial. Not so certain about the other one --
might need to be conditioned on cygwin. I don't know
much about perl, really, and the Cwd change is something
I seem to recall I picked up from an email in an archive
on svk ...

Regards -- Eliot

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