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 src/w32proc.c (new_child): Force Windows to reserve only 64KB of
 stack for each reader_thread, instead of defaulting to 8MB
 determined by the linker.  This avoids failures in creating
 subprocesses on Windows 7, see the discussion in this thread:
 http://lists.gnu.org/archive/html/emacs-devel/2012-03/msg00119.html.