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On Windows there are tiny delay between call to os.unlink and real file 
removing. Periodically it leads to unittest crashes in cases like this:
test.support.unlink(filename)
f = open(filename, 'wb')
Proposed solution: wait in support.unlink for end of deletion asking 
os.stat for removed file (only if os.name == 'nt', of course).
Also test.test_linecache:LineCacheTests.test_checkcache should be fixed 
- this one miss to close last opened file and Windows cannot remove it.
Both patches for trunk and py3k is attached.