Fix race condition in win32 signal handling.
There was a race condition where the receiving pipe could be closed by the
child thread if the main thread was pre-empted before it got a chance to
create a new one, and the dispatch thread ran to completion during that time.
One symptom of this is that rows in pg_listener could be dropped under
Analysis and original patch by Radu Ilie, with some small
modifications by Magnus Hagander.
signal.c (r1.22 -> r22.214.171.124)
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