Use StructureNotifyMaskMask as the mask, as this enables an application

Use StructureNotifyMaskMask as the mask, as this enables an application

Tue Mar 17 02:02:02 1998  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* gdk/gdk.c (gdk_dnd_drag_leave): Use StructureNotifyMaskMask as
	the mask, as this enables an application listening to those events
	to catch the root events.  Thanks to Maciej for pointing us in the
	right direction.
	(gdk_dnd_drag_enter): Likewise.
	(gdk_dnd_drag_leave): Likewise.
	* gdk/gdkwindow.c (gdk_window_dnd_data_set): Likewise.