user32: TrackPopupMenu(Ex) fixes

[Rein Klazes]

Hi,

(resent with correct from: address this time)

Fix another bug in the application of bug#9615. TrackMenuPopupEx is
called with a NULL menu handle, and the application crashes on the
returned NULL value in the following INITMENU message.

for the Changelog:
     Check for invalid menu handle passed to TrackPopupMenu and
TrackPopupMenuEx.
     Add conformance tests for the correct handling of those.
     TrackPopupMenu should call TrackPopupMenuEx, not the other way.


Rein.

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