Do not pass pipe handle to WaitForMultipleObjects

Do not pass pipe handle to WaitForMultipleObjects

The Remarks section in WaitForMultipleObjects describes what kind of
handles the function can wait for. Pipe handles are not listed there.

The problem was introduced in c18459e66e8e71a8765bb9b8e2b3d2ba61855a3f

While it might be possible to setup overlapped reads on the pipe handles
and then wait on overlapped events, it would result in quite complex
code. As a tradeoff, simply keep peeking at the pipes every 100 ms.

Change-Id: I6ba4f4bf4c1d2af856027cca36ffd6d4f7f49f36
Bug: 14657
Reviewed-on: https://code.wireshark.org/review/29163
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Roland Knall <rknall@gmail.com>