zero before clearing area.
* xfns.c (Fx_change_window_property): Use long array when format is 32.
(Fx_window_property): If format is 32 and long is bigger than 32 bits,
convert long array returned from XGetWindowProperty to an int array.
+ (x_set_tool_bar_lines): Check that width and height is greater than
+ zero before clearing area.
* xselect.c (x_reply_selection_request): Pass long array to
XChangeProperty so that 64 bit longs are handeled correctly.