tmpdir on windows

[John Darrington]

In PSPP we are using the path_search function from the tmpdir module to 
determine the path for temporary files.

Windows users have complained that it puts temporary files in places they
consider to be inappropriate.  I did a bit of research, and found that the 
"normal" path on windows depends on exactly which version of windows it is.
So I came up with this patch, which uses the w32 native functions to get this 
path.

Our windows port maintainer has been using it for a few weeks now and hasn't
discovered any problems.

J'

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