return clones. Since the results of getStyle are extended later in the code
by the inlineStyle, this fixes a case where kml.styleUrl symbolizers can
be changed by <Style> blocks attached to features which share a style.
r=me. (Closes#1578)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@8776 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf