user32: TrackPopupMenu(Ex) fixes

[Rein Klazes]

Hi,

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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