[Dillo-dev] [patch]: fix signature of Html_add_new_linkimage()

A small cleanup patch. * The return value of Html_add_new_linkimage() is never used, so it should return void. * There's no need to pass the url to Html_add_new_linkimage() as a (DilloUrl **), so just copy the (DilloUrl *) pointer. Regards, Jeremy Henty