[XForms] Enable FL_FREE objects to optimize their drawing

[Angus Leeming]

The attached patch passes the associated (XEvent * xev) to 
fl_handle_object on an FL_DRAW event. This XEvent * is not used at 
all by any of xforms' "native" widgets, but an FL_FREE object is able 
to make use of this info to redraw only the part of the window that 
has changed.

An example being the FL_FREE object used by LyX for the main screen.

I can see no harm in adding this patch as it does not change existing 
behaviour at all. Thoughts?

Angus
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