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Fixed in rev 45631 on the trunk, and rev 45632 on the 2.4
branch.

Armin, I agree this could use a better approach.  I settled
for a micro-fix here because this specific one accounts for
a report of Zope Corp's ZEO hanging on Windows, and it was
an odd way to change ntpath.abspath to begin with.

Note that I added a new Lib/test/threaded_import_hangers.py
to check that tempfile.TemporaryFile and os.path.abspath
don't hang anymore, and that's designed to make it easy to
add additional tests of this kind.