kernel32: ConnectNamedPort should return 0 and set ERROR_PIPE_CONNECTED on success in overlapped mode

[Dan Kegel]

This fixes http://bugs.winehq.org/show_bug.cgi?id=16550
and lets the Chromium unit tests get further.

Our conformance test for overlapped ConnectNamedPort
is permissive, and allows the (very reasonable) old
behavior.  I suspect Win98 behaved that way, so I don't
think we can tighten up the test.
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