[PATCH] Correct use of GetLastError in ctypes windows locking code

[Martin (gzlist)]

While rediscovering that bazaar doesn't work under Win98 due to
locking failures, noticed a simple problem was causing the errors to
be even less helpful than they would be otherwise. Attached patch
fixes the problem.

Original patch also used ctypes.FormatError but can't see any
guideline in the devdocs on what the encoding of strings in Exception
objects needs to be to get on to the console in a sane manner. (For
instance, under German windows, the message will be encoded as CP1252
but the console may be CP850).

Martin
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