[SECURITY] Fedora 18 Update: privoxy-3.0.21-1.fc18

Privoxy is a web proxy with advanced filtering capabilities for protecting privacy, filtering web page content, managing cookies, controlling access, and removing ads, banners, pop-ups and other obnoxious Internet junk. Privoxy has a very flexible configuration and can be customized to suit individual needs and tastes. Privoxy has applicat ion for both stand-alone systems and multi-user networks. Privoxy is based on the Internet Junkbuster.