Gets the total number of AtspiHyperlink objects that an
AtspiHypertext implementor has.
Return value
Type:gint
A #gint indicating the number of AtspiHyperlink objects
of the AtspiHypertext implementor, or -1 if
the number cannot be determined (for example, if the
AtspiHypertext object is so large that it is not
all currently in the memory cache).