winex11: Add support for animated cursors in X11 driver (try 4).

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    Use DrawIconEx to extract the multiple frames of an animated
cursor.  Please note that this patch does not add support for the
delay between frames, as I have not yet found a good way to extract
this information.  This version cleans up the loop over the frame data
to be more straightforward.  Version 3 fixed an improper usage of
HeapReAlloc.  Version 2 moved the allocation of all the resources
needed to obtain the frame data, avoiding having to create and destroy
these resources multiple times for a single cursor.  Please forgive
the numerous attempts.
ChangeLog:
    winex11: Add support for animated cursors in X11 driver.
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