[issue28168] Use _winapi.WaitForMultipleObjects in Popen.wait()

[STINNER Victor]

STINNER Victor added the comment:

> I decided to make it an error to pass an empty sequence

It makes sense since the original WaitForMultipleObjects() also requires at least one object:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms687025(v=vs.85).aspx

nCount [in]

    The number of object handles in the array pointed to by lpHandles. The maximum number of object handles is MAXIMUM_WAIT_OBJECTS. This parameter cannot be zero.

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<http://bugs.python.org/issue28168>
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